6.8-rt8 testing

John B. Wyatt IV
2024-03-28T15:25:20Z

Hello linux-rt-users,

Did a quick look over. The NMIs seem to trigger the same flush to console when
the system crashes that was previously seen in my 6.7 linked below with the
NMI watchdog. I reran the 6.6 test and no NMI was reported with fully
preemptive and the realtime tuned profile. It was user error. Posting more of
the complete debugging logs if you need to look them over.

Caller info was enabled. No modifications to the source code were made.

Link to lscpu and previous NMI reports:

https://lore.kernel.org/linux-rt-users/ZdUmpblrzX0pcPjz@thinkpad2021/T/#mec258264be95dcba23970def7b248af0c6e942b2

https://lore.kernel.org/linux-rt-users/ZfSfrzak9WS0ZFv7@thinkpad2021/

-----------------------------
NMI Backtraces for 6.8-rt8 no forced preemption with tuned realtime profile
-----------------------------

[ T2482] Kernel panic - not syncing: sysrq triggered crash
[ C56] NMI backtrace for cpu 56
[ C56] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ C56] RIP: 0010:io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] Code: 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 0f b6 8f c1 00 00 00 89 d0 0f b7 57 08 d3 e6 01 f2 ee <c3> cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90
All code
========
0: 0f 1f 00 nopl (%rax)
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
18: 0f b6 8f c1 00 00 00 movzbl 0xc1(%rdi),%ecx
1f: 89 d0 mov %edx,%eax
21: 0f b7 57 08 movzwl 0x8(%rdi),%edx
25: d3 e6 shl %cl,%esi
27: 01 f2 add %esi,%edx
29: ee out %al,(%dx)
2a:* c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: 0f 1f 40 00 nopl 0x0(%rax)
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop

Code starting with the faulting instruction
===========================================
0: c3 ret
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: 0f 1f 40 00 nopl 0x0(%rax)
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ C56] RSP: 0018:ff69eb60700bfa68 EFLAGS: 00000002
[ C56] RAX: 0000000000000020 RBX: ffffffff9349b980 RCX: 0000000000000000
[ C56] RDX: 00000000000003f8 RSI: 0000000000000000 RDI: ffffffff9349b980
[ C56] RBP: 0000000000000020 R08: 6e6e75725f726e5f R09: 2020202020676e69
[ C56] R10: 00000000682e2020 R11: 00000000682e2020 R12: ffffffff9349b980
[ C56] R13: ffffffff933cd49c R14: 0000000000000000 R15: 0000000000000000
[ C56] FS: 00007fa9252d9740(0000) GS:ff24b975ff600000(0000) knlGS:0000000000000000
[ C56] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ C56] CR2: 00007fa9254b5650 CR3: 0000002088d94003 CR4: 0000000000771ef0
[ C56] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ C56] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ C56] PKRU: 55555554
[ C56] Call Trace:
[ C56] <NMI>
[ C56] ? nmi_cpu_backtrace (lib/nmi_backtrace.c:115)
[ C56] ? nmi_cpu_backtrace_handler (arch/x86/kernel/apic/hw_nmi.c:47 (discriminator 1))
[ C56] ? nmi_handle (arch/x86/kernel/nmi.c:150)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] ? default_do_nmi (arch/x86/kernel/nmi.c:351)
[ C56] ? exc_nmi (arch/x86/kernel/nmi.c:545)
[ C56] ? end_repeat_nmi (arch/x86/entry/entry_64.S:1409)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] </NMI>
[ C56] <TASK>
[ C56] serial8250_console_putchar (./include/linux/serial_core.h:704 drivers/tty/serial/8250/8250_port.c:3340)
[ C56] ? __pfx_serial8250_console_putchar (drivers/tty/serial/8250/8250_port.c:3336)
[ C56] uart_console_write (drivers/tty/serial/serial_core.c:2140)
[ C56] serial8250_console_write_atomic (drivers/tty/serial/8250/8250_port.c:3621)
[ C56] nbcon_emit_next_record (kernel/printk/nbcon.c:938)
[ C56] __nbcon_atomic_flush_all (kernel/printk/nbcon.c:1191 (discriminator 1) kernel/printk/nbcon.c:1327 (discriminator 1))
[ C56] vprintk_emit (kernel/printk/printk.c:2424)
[ C56] _printk (kernel/printk/printk.c:2484)
[ C56] panic (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/panic.c:532 kernel/panic.c:343)
[ C56] ? _printk (kernel/printk/printk.c:2484)
[ C56] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ C56] __handle_sysrq (drivers/tty/sysrq.c:601)
[ C56] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ C56] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ C56] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ C56] vfs_write (fs/read_write.c:588)
[ C56] ? __do_sys_newfstatat (fs/stat.c:471 (discriminator 1))
[ C56] ksys_write (fs/read_write.c:643)
[ C56] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ C56] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C56] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ C56] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C56] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ C56] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C56] ? __count_memcg_events (mm/memcontrol.c:722 (discriminator 1) mm/memcontrol.c:961 (discriminator 1))
[ C56] ? handle_mm_fault (mm/memory.c:5347 mm/memory.c:5486)
[ C56] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ C56] ? up_read (./arch/x86/include/asm/preempt.h:103 kernel/locking/rwsem.c:1354 kernel/locking/rwsem.c:1622)
[ C56] ? do_user_addr_fault (arch/x86/mm/fault.c:1359)
[ C56] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ C56] RIP: 0033:0x7fa9253e4c94
[ C56] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ C56] RSP: 002b:00007fff88bc8188 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ C56] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa9253e4c94
[ C56] RDX: 0000000000000002 RSI: 0000560b1e01f490 RDI: 0000000000000001
[ C56] RBP: 00007fff88bc81b0 R08: 0000000000000410 R09: 0000000000000001
[ C56] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ C56] R13: 0000560b1e01f490 R14: 00007fa9254b55c0 R15: 00007fa9254b2f20
[ C56] </TASK>
[ C56] NMI backtrace for cpu 56
[ C56] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ C56] RIP: 0010:io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] Code: 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 0f b6 8f c1 00 00 00 89 d0 0f b7 57 08 d3 e6 01 f2 ee <c3> cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90
All code
========
0: 0f 1f 00 nopl (%rax)
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
18: 0f b6 8f c1 00 00 00 movzbl 0xc1(%rdi),%ecx
1f: 89 d0 mov %edx,%eax
21: 0f b7 57 08 movzwl 0x8(%rdi),%edx
25: d3 e6 shl %cl,%esi
27: 01 f2 add %esi,%edx
29: ee out %al,(%dx)
2a:* c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: 0f 1f 40 00 nopl 0x0(%rax)
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop

Code starting with the faulting instruction
===========================================
0: c3 ret
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: 0f 1f 40 00 nopl 0x0(%rax)
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ C56] RSP: 0018:ff69eb60700bfa68 EFLAGS: 00000002
[ C56] RAX: 0000000000000066 RBX: ffffffff9349b980 RCX: 0000000000000000
[ C56] RDX: 00000000000003f8 RSI: 0000000000000000 RDI: ffffffff9349b980
[ C56] RBP: 0000000000000066 R08: 303178302f303178 R09: 302b646165726874
[ C56] R10: 6461657268746b5f R11: 7866705f5f203f20 R12: ffffffff9349b980
[ C56] R13: ffffffff933cd492 R14: 0000000000000000 R15: 0000000000000000
[ C56] FS: 00007fa9252d9740(0000) GS:ff24b975ff600000(0000) knlGS:0000000000000000
[ C56] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ C56] CR2: 00007fa9254b5650 CR3: 0000002088d94003 CR4: 0000000000771ef0
[ C56] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ C56] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ C56] PKRU: 55555554
[ C56] Call Trace:
[ C56] <NMI>
[ C56] ? nmi_cpu_backtrace (lib/nmi_backtrace.c:115)
[ C56] ? nmi_cpu_backtrace_handler (arch/x86/kernel/apic/hw_nmi.c:47 (discriminator 1))
[ C56] ? nmi_handle (arch/x86/kernel/nmi.c:150)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] ? default_do_nmi (arch/x86/kernel/nmi.c:351)
[ C56] ? exc_nmi (arch/x86/kernel/nmi.c:545)
[ C56] ? end_repeat_nmi (arch/x86/entry/entry_64.S:1409)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] ? io_serial_out (arch/x86/kernel/early_printk.c:105)
[ C56] </NMI>
[ C56] <TASK>
[ C56] serial8250_console_putchar (./include/linux/serial_core.h:704 drivers/tty/serial/8250/8250_port.c:3340)
[ C56] ? __pfx_serial8250_console_putchar (drivers/tty/serial/8250/8250_port.c:3336)
[ C56] uart_console_write (drivers/tty/serial/serial_core.c:2140)
[ C56] serial8250_console_write_atomic (drivers/tty/serial/8250/8250_port.c:3621)
[ C56] nbcon_emit_next_record (kernel/printk/nbcon.c:938)
[ C56] __nbcon_atomic_flush_all (kernel/printk/nbcon.c:1191 (discriminator 1) kernel/printk/nbcon.c:1327 (discriminator 1))
[ C56] vprintk_emit (kernel/printk/printk.c:2424)
[ C56] _printk (kernel/printk/printk.c:2484)
[ C56] panic (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/panic.c:532 kernel/panic.c:343)
[ C56] ? _printk (kernel/printk/printk.c:2484)
[ C56] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ C56] __handle_sysrq (drivers/tty/sysrq.c:601)
[ C56] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ C56] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ C56] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ C56] vfs_write (fs/read_write.c:588)
[ C56] ? __do_sys_newfstatat (fs/stat.c:471 (discriminator 1))
[ C56] ksys_write (fs/read_write.c:643)
[ C56] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ C56] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C56] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ C56] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C56] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ C56] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C56] ? __count_memcg_events (mm/memcontrol.c:722 (discriminator 1) mm/memcontrol.c:961 (discriminator 1))
[ C56] ? handle_mm_fault (mm/memory.c:5347 mm/memory.c:5486)
[ C56] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ C56] ? up_read (./arch/x86/include/asm/preempt.h:103 kernel/locking/rwsem.c:1354 kernel/locking/rwsem.c:1622)
[ C56] ? do_user_addr_fault (arch/x86/mm/fault.c:1359)
[ C56] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ C56] RIP: 0033:0x7fa9253e4c94
[ C56] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ C56] RSP: 002b:00007fff88bc8188 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ C56] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa9253e4c94
[ C56] RDX: 0000000000000002 RSI: 0000560b1e01f490 RDI: 0000000000000001
[ C56] RBP: 00007fff88bc81b0 R08: 0000000000000410 R09: 0000000000000001
[ C56] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ C56] R13: 0000560b1e01f490 R14: 00007fa9254b55c0 R15: 00007fa9254b2f20
[ C56] </TASK>
[ T2482] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ T2482] Call Trace:
[ T2482] <TASK>
[ T2482] panic (kernel/panic.c:344)
[ T2482] ? _printk (kernel/printk/printk.c:2484)
[ T2482] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ T2482] __handle_sysrq (drivers/tty/sysrq.c:601)
[ T2482] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ T2482] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ T2482] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ T2482] vfs_write (fs/read_write.c:588)
[ T2482] ? __do_sys_newfstatat (fs/stat.c:471 (discriminator 1))
[ T2482] ksys_write (fs/read_write.c:643)
[ T2482] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ T2482] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ T2482] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ T2482] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ T2482] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ T2482] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ T2482] ? __count_memcg_events (mm/memcontrol.c:722 (discriminator 1) mm/memcontrol.c:961 (discriminator 1))
[ T2482] ? handle_mm_fault (mm/memory.c:5347 mm/memory.c:5486)
[ T2482] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ T2482] ? up_read (./arch/x86/include/asm/preempt.h:103 kernel/locking/rwsem.c:1354 kernel/locking/rwsem.c:1622)
[ T2482] ? do_user_addr_fault (arch/x86/mm/fault.c:1359)
[ T2482] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ T2482] RIP: 0033:0x7fa9253e4c94
[ T2482] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ T2482] RSP: 002b:00007fff88bc8188 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ T2482] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa9253e4c94
[ T2482] RDX: 0000000000000002 RSI: 0000560b1e01f490 RDI: 0000000000000001
[ T2482] RBP: 00007fff88bc81b0 R08: 0000000000000410 R09: 0000000000000001
[ T2482] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ T2482] R13: 0000560b1e01f490 R14: 00007fa9254b55c0 R15: 00007fa9254b2f20
[ T2482] </TASK>
[ T2482] Shutting down cpus with NMI
[ T2482] Kernel Offset: 0xf600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ T2482] ---[ end Kernel panic - not syncing: sysrq triggered crash ]---

-----------------------------
NMI Backtraces for 6.8-rt8 no forced preemption with tuned throughput-performance profile
-----------------------------

[ T2549] sysrq: Trigger a crash
[ T2549] Kernel panic - not syncing: sysrq triggered crash
[ C0] NMI backtrace for cpu 0
[ C0] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ C0] RIP: 0010:io_serial_in (arch/x86/kernel/early_printk.c:100)
[ C0] Code: cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 0f b6 8f c1 00 00 00 0f b7 57 08 d3 e6 01 f2 ec <0f> b6 c0 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
All code
========
0: cc int3
1: 0f 1f 40 00 nopl 0x0(%rax)
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
1a: 0f b6 8f c1 00 00 00 movzbl 0xc1(%rdi),%ecx
21: 0f b7 57 08 movzwl 0x8(%rdi),%edx
25: d3 e6 shl %cl,%esi
27: 01 f2 add %esi,%edx
29: ec in (%dx),%al
2a:* 0f b6 c0 movzbl %al,%eax <-- trapping instruction
2d: c3 ret
2e: cc int3
2f: cc int3
30: cc int3
31: cc int3
32: 0f 1f 00 nopl (%rax)
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop

Code starting with the faulting instruction
===========================================
0: 0f b6 c0 movzbl %al,%eax
3: c3 ret
4: cc int3
5: cc int3
6: cc int3
7: cc int3
8: 0f 1f 00 nopl (%rax)
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ C0] RSP: 0018:ff6f5a3e30adfb18 EFLAGS: 00000002
[ C0] RAX: ffffffff8b5e1500 RBX: 0000000000000000 RCX: 0000000000000000
[ C0] RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff8dc9b980
[ C0] RBP: 000000000000270e R08: ffffffff8dbcd46b R09: ff6f5a3e30adfa77
[ C0] R10: 0000000033353532 R11: 0000000035353254 R12: 0000000000000020
[ C0] R13: ffffffff8dc9b980 R14: 0000000000000000 R15: 0000000000000000
[ C0] FS: 00007f992140b740(0000) GS:ff4bee3e7f800000(0000) knlGS:0000000000000000
[ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ C0] CR2: 00007f99215e7650 CR3: 0000000106bcc001 CR4: 0000000000771ef0
[ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ C0] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ C0] PKRU: 55555554
[ C0] Call Trace:
[ C0] <NMI>
[ C0] ? nmi_cpu_backtrace (lib/nmi_backtrace.c:115)
[ C0] ? nmi_cpu_backtrace_handler (arch/x86/kernel/apic/hw_nmi.c:47 (discriminator 1))
[ C0] ? nmi_handle (arch/x86/kernel/nmi.c:150)
[ C0] ? io_serial_in (arch/x86/kernel/early_printk.c:100)
[ C0] ? default_do_nmi (arch/x86/kernel/nmi.c:351)
[ C0] ? exc_nmi (arch/x86/kernel/nmi.c:545)
[ C0] ? end_repeat_nmi (arch/x86/entry/entry_64.S:1409)
[ C0] ? mem16_serial_in (drivers/tty/serial/8250/8250_port.c:381)
[ C0] ? io_serial_in (arch/x86/kernel/early_printk.c:100)
[ C0] ? io_serial_in (arch/x86/kernel/early_printk.c:100)
[ C0] ? io_serial_in (arch/x86/kernel/early_printk.c:100)
[ C0] </NMI>
[ C0] <TASK>
[ C0] wait_for_xmitr (drivers/tty/serial/8250/8250.h:117 drivers/tty/serial/8250/8250.h:139 drivers/tty/serial/8250/8250_port.c:2098 drivers/tty/serial/8250/8250_port.c:2116)
[ C0] serial8250_console_putchar (./include/linux/serial_core.h:704 drivers/tty/serial/8250/8250_port.c:3340)
[ C0] ? __pfx_serial8250_console_putchar (drivers/tty/serial/8250/8250_port.c:3336)
[ C0] uart_console_write (drivers/tty/serial/serial_core.c:2140)
[ C0] serial8250_console_write_atomic (drivers/tty/serial/8250/8250_port.c:3621)
[ C0] nbcon_emit_next_record (kernel/printk/nbcon.c:938)
[ C0] __nbcon_atomic_flush_all (kernel/printk/nbcon.c:1191 (discriminator 1) kernel/printk/nbcon.c:1327 (discriminator 1))
[ C0] vprintk_emit (kernel/printk/printk.c:2424)
[ C0] _printk (kernel/printk/printk.c:2484)
[ C0] panic (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/panic.c:532 kernel/panic.c:343)
[ C0] ? _printk (kernel/printk/printk.c:2484)
[ C0] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ C0] __handle_sysrq (drivers/tty/sysrq.c:601)
[ C0] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ C0] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ C0] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ C0] vfs_write (fs/read_write.c:588)
[ C0] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ C0] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C0] ksys_write (fs/read_write.c:643)
[ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ C0] RIP: 0033:0x7f9921516c94
[ C0] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ C0] RSP: 002b:00007ffdcc3fdb68 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ C0] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f9921516c94
[ C0] RDX: 0000000000000002 RSI: 000055dd6e9f9490 RDI: 0000000000000001
[ C0] RBP: 00007ffdcc3fdb90 R08: 0000000000000410 R09: 0000000000000001
[ C0] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ C0] R13: 000055dd6e9f9490 R14: 00007f99215e75c0 R15: 00007f99215e4f20
[ C0] </TASK>
[ T2549] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ T2549] Call Trace:
[ T2549] <TASK>
[ T2549] panic (kernel/panic.c:344)
[ T2549] ? _printk (kernel/printk/printk.c:2484)
[ T2549] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ T2549] __handle_sysrq (drivers/tty/sysrq.c:601)
[ T2549] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ T2549] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ T2549] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ T2549] vfs_write (fs/read_write.c:588)
[ T2549] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ T2549] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ T2549] ksys_write (fs/read_write.c:643)
[ T2549] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ T2549] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ T2549] RIP: 0033:0x7f9921516c94
[ T2549] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ T2549] RSP: 002b:00007ffdcc3fdb68 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ T2549] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f9921516c94
[ T2549] RDX: 0000000000000002 RSI: 000055dd6e9f9490 RDI: 0000000000000001
[ T2549] RBP: 00007ffdcc3fdb90 R08: 0000000000000410 R09: 0000000000000001
[ T2549] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ T2549] R13: 000055dd6e9f9490 R14: 00007f99215e75c0 R15: 00007f99215e4f20
[ T2549] </TASK>
[ C0] NMI backtrace for cpu 0
[ C0] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ C0] RIP: 0010:delay_halt_tpause (arch/x86/lib/delay.c:118)
[ C0] Code: cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 48 8d 04 37 31 c9 48 89 c2 48 c1 ea 20 66 0f ae f1 <c3> cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90
All code
========
0: cc int3
1: 0f 1f 00 nopl (%rax)
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
19: 48 8d 04 37 lea (%rdi,%rsi,1),%rax
1d: 31 c9 xor %ecx,%ecx
1f: 48 89 c2 mov %rax,%rdx
22: 48 c1 ea 20 shr $0x20,%rdx
26: 66 0f ae f1 tpause %ecx
2a:* c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop

Code starting with the faulting instruction
===========================================
0: c3 ret
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ C0] RSP: 0018:ff6f5a3e30adfcf8 EFLAGS: 00000002
[ C0] RAX: 0000018b5534ddb6 RBX: 0000000000000121 RCX: 0000000000000000
[ C0] RDX: 000000000000018b RSI: 0000000000000121 RDI: 0000018b5534dc95
[ C0] RBP: 0000018b5534dc95 R08: ffffffff8dbcd468 R09: ff6f5a3e30adf96f
[ C0] R10: 0000000039343532 R11: 0000000034353254 R12: 000000000001ed2a
[ C0] R13: 0000000000000000 R14: 0000000000000063 R15: 0000000000000000
[ C0] FS: 00007f992140b740(0000) GS:ff4bee3e7f800000(0000) knlGS:0000000000000000
[ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ C0] CR2: 00007f99215e7650 CR3: 0000000106bcc001 CR4: 0000000000771ef0
[ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ C0] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ C0] PKRU: 55555554
[ C0] Call Trace:
[ C0] <NMI>
[ C0] ? nmi_cpu_backtrace (lib/nmi_backtrace.c:115)
[ C0] ? nmi_cpu_backtrace_handler (arch/x86/kernel/apic/hw_nmi.c:47 (discriminator 1))
[ C0] ? nmi_handle (arch/x86/kernel/nmi.c:150)
[ C0] ? delay_halt_tpause (arch/x86/lib/delay.c:118)
[ C0] ? default_do_nmi (arch/x86/kernel/nmi.c:351)
[ C0] ? exc_nmi (arch/x86/kernel/nmi.c:545)
[ C0] ? end_repeat_nmi (arch/x86/entry/entry_64.S:1409)
[ C0] ? delay_halt_tpause (arch/x86/lib/delay.c:118)
[ C0] ? delay_halt_tpause (arch/x86/lib/delay.c:118)
[ C0] ? delay_halt_tpause (arch/x86/lib/delay.c:118)
[ C0] </NMI>
[ C0] <TASK>
[ C0] delay_halt.part.0 (arch/x86/lib/delay.c:163)
[ C0] native_stop_other_cpus (./include/linux/bitmap.h:400 ./include/linux/cpumask.h:684 arch/x86/kernel/smp.c:201)
[ C0] panic (./arch/x86/include/asm/smp.h:54 kernel/panic.c:264 kernel/panic.c:365)
[ C0] ? _printk (kernel/printk/printk.c:2484)
[ C0] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ C0] __handle_sysrq (drivers/tty/sysrq.c:601)
[ C0] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ C0] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ C0] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ C0] vfs_write (fs/read_write.c:588)
[ C0] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ C0] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ C0] ksys_write (fs/read_write.c:643)
[ C0] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ C0] RIP: 0033:0x7f9921516c94
[ C0] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ C0] RSP: 002b:00007ffdcc3fdb68 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ C0] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f9921516c94
[ C0] RDX: 0000000000000002 RSI: 000055dd6e9f9490 RDI: 0000000000000001
[ C0] RBP: 00007ffdcc3fdb90 R08: 0000000000000410 R09: 0000000000000001
[ C0] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ C0] R13: 000055dd6e9f9490 R14: 00007f99215e75c0 R15: 00007f99215e4f20
[ C0] </TASK>
[ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 381.956 msecs
[ T2549] Shutting down cpus with NMI
[ T2549] Kernel Offset: 0x9e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ T2549] ---[ end Kernel panic - not syncing: sysrq triggered crash ]---

-----------------------------
No NMIs backtraces found for 6.8-rt8 fully pre-emptive with tuned realtime profile
-----------------------------

[ T5507] Call Trace:
[ T5507] <TASK>
[ T5507] __schedule (kernel/sched/core.c:5420 kernel/sched/core.c:6747)
[ T5507] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107)
[ T5507] schedule (kernel/sched/core.c:6823 kernel/sched/core.c:6837)
[ T5507] smpboot_thread_fn (kernel/smpboot.c:160)
[ T5507] kthread (kernel/kthread.c:388)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork (arch/x86/kernel/process.c:147)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork_asm (arch/x86/entry/entry_64.S:251)
[ T5507] </TASK>
[ T5507] task:irq_work/5 state:S stack:0 pid:65 tgid:65 ppid:2 flags:0x00004000
[ T5507] Call Trace:
[ T5507] <TASK>
[ T5508] S
[ T5507] __schedule (kernel/sched/core.c:5420 kernel/sched/core.c:6747)
[ T5508] irq/95-nvme0q19 3530 322.126516 E 325.121736 3.000000 0.039704 4 49
[ T5507] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107)
[ T5508] 0.000000 0.039704 0.000000 0.000000
[ T5507] schedule (kernel/sched/core.c:6823 kernel/sched/core.c:6837)
[ T5508] /
[ T5507] smpboot_thread_fn (kernel/smpboot.c:160)
[ T5507] kthread (kernel/kthread.c:388)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork (arch/x86/kernel/process.c:147)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork_asm (arch/x86/entry/entry_64.S:251)
[ T5507] </TASK>
[ T5507] task:migration/5 state:S stack:0 pid:66 tgid:66 ppid:2 flags:0x00004000
[ T5507] Stopper: 0x0 <- 0x0
[ T5507] Call Trace:
[ T5507] <TASK>
[ T5507] __schedule (kernel/sched/core.c:5420 kernel/sched/core.c:6747)
[ T5507] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107)
[ T5507] schedule (kernel/sched/core.c:6823 kernel/sched/core.c:6837)
[ T5507] smpboot_thread_fn (kernel/smpboot.c:160)
[ T5507] kthread (kernel/kthread.c:388)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork (arch/x86/kernel/process.c:147)
[ T5508]
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork_asm (arch/x86/entry/entry_64.S:251)
[ T5507] </TASK>
[ T5508] cpu#143, 1900.000 MHz
[ T5508] .nr_running : 0
[ T5508] .nr_switches : 7623
[ T5508] .nr_uninterruptible : -5
[ T5508] .next_balance : 4298.534188
[ T5508] .curr->pid : 0
[ T5508] .clock : 3872984.828013
[ T5508] .clock_task : 3872944.105495
[ T5508] .avg_idle : 1000000
[ T5508] .max_idle_balance_cost : 500000
[ T5508]
[ T5508] rt_rq[143]:
[ T5508] .rt_nr_running : 0
[ T5508] .rt_throttled : 0
[ T5508] .rt_time : 0.000000
[ T5508] .rt_runtime : 0.000001
[ T5508]
[ T5508] dl_rq[143]:
[ T5508] .dl_nr_running : 0
[ T5508] .dl_bw->bw : -1
[ T5508] .dl_bw->total_bw : 0
[ T5508]
[ T5508] runnable tasks:
[ T5508] S task PID tree-key switches prio wait-time sum-exec sum-sleep
[ T5508] -------------------------------------------------------------------------------------------------------------
[ T5507] task:rcuc/5 state:S stack:0 pid:67 tgid:67 ppid:2 flags:0x00004000
[ T5507] Call Trace:
[ T5507] <TASK>
[ T5507] __schedule (kernel/sched/core.c:5420 kernel/sched/core.c:6747)
[ T5507] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107)
[ T5507] schedule (kernel/sched/core.c:6823 kernel/sched/core.c:6837)
[ T5507] smpboot_thread_fn (kernel/smpboot.c:160)
[ T5507] kthread (kernel/kthread.c:388)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork (arch/x86/kernel/process.c:147)
[ T5507] ? __pfx_kthread (kernel/kthread.c:341)
[ T5507] ret_from_fork_asm (arch/x86/entry/entry_64.S:251)
[ T5507] </TASK>
[ T5504] sysrq: Trigger a crash
[ T5504] Kernel panic - not syncing: sysrq triggered crash
[ T5504] Hardware name: Intel Corporation D50DNP1SBB/D50DNP1SBB, BIOS SE5C7411.86B.9409.D04.2212261349 12/26/2022
[ T5504] Call Trace:
[ T5504] <TASK>
[ T5504] panic (kernel/panic.c:344)
[ T5504] ? _printk (kernel/printk/printk.c:2484)
[ T5504] sysrq_handle_crash (drivers/tty/sysrq.c:154)
[ T5504] __handle_sysrq (drivers/tty/sysrq.c:601)
[ T5504] write_sysrq_trigger (drivers/tty/sysrq.c:1174)
[ T5504] proc_reg_write (fs/proc/inode.c:334 fs/proc/inode.c:346)
[ T5504] ? preempt_count_add (./include/linux/ftrace.h:974 (discriminator 1) kernel/sched/core.c:5863 (discriminator 1) kernel/sched/core.c:5860 (discriminator 1) kernel/sched/core.c:5888 (discriminator 1))
[ T5504] vfs_write (fs/read_write.c:588)
[ T5504] ? syscall_exit_to_user_mode (kernel/entry/common.c:215)
[ T5504] ? do_syscall_64 (arch/x86/entry/common.c:102)
[ T5504] ksys_write (fs/read_write.c:643)
[ T5504] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ T5504] ? do_user_addr_fault (arch/x86/mm/fault.c:1359)
[ T5504] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)
[ T5504] RIP: 0033:0x7fdae226dc94
[ T5504] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 76 0d 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
All code
========
0: c7 00 16 00 00 00 movl $0x16,(%rax)
6: b8 ff ff ff ff mov $0xffffffff,%eax
b: c3 ret
c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
13: 00 00 00
16: f3 0f 1e fa endbr64
1a: 80 3d d5 76 0d 00 00 cmpb $0x0,0xd76d5(%rip) # 0xd76f6
21: 74 13 je 0x36
23: b8 01 00 00 00 mov $0x1,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 54 ja 0x86
32: c3 ret
33: 0f 1f 00 nopl (%rax)
36: 55 push %rbp
37: 48 89 e5 mov %rsp,%rbp
3a: 48 83 ec 20 sub $0x20,%rsp
3e: 48 rex.W
3f: 89 .byte 0x89

Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 54 ja 0x5c
8: c3 ret
9: 0f 1f 00 nopl (%rax)
c: 55 push %rbp
d: 48 89 e5 mov %rsp,%rbp
10: 48 83 ec 20 sub $0x20,%rsp
14: 48 rex.W
15: 89 .byte 0x89
[ T5504] RSP: 002b:00007ffce96577e8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[ T5504] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fdae226dc94
[ T5504] RDX: 0000000000000002 RSI: 000055a5240d0490 RDI: 0000000000000001
[ T5504] RBP: 00007ffce9657810 R08: 0000000000000410 R09: 0000000000000001
[ T5504] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000002
[ T5504] R13: 000055a5240d0490 R14: 00007fdae233e5c0 R15: 00007fdae233bf20
[ T5504] </TASK>
[ T5504] Kernel Offset: 0x1b200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ T5504] ---[ end Kernel panic - not syncing: sysrq triggered crash ]---

--
Sincerly,
John Wyatt
Software Engineer, Core Kernel
Red Hat