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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR11MB7858 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 7692ca4ea522fb744009ed8f49a77e96eb1097cb ("8250 ops") https://git.kernel.org/cgit/linux/kernel/git/jirislaby/linux.git devel in testcase: boot config: x86_64-rhel-9.4-rust compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------+------------+------------+ | | d6c7cdb02e | 7692ca4ea5 | +---------------------------------------------+------------+------------+ | boot_successes | 18 | 0 | | boot_failures | 0 | 19 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 19 | | Oops | 0 | 19 | | RIP:serial8250_register_8250_port | 0 | 19 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 19 | +---------------------------------------------+------------+------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202508291640.97e82aad-lkp@intel.com [ 22.467865][ T1] BUG: kernel NULL pointer dereference, address: 0000000000000028 [ 22.468492][ T1] #PF: supervisor read access in kernel mode [ 22.468492][ T1] #PF: error_code(0x0000) - not-present page [ 22.468492][ T1] PGD 0 P4D 0 [ 22.468492][ T1] Oops: Oops: 0000 [#1] SMP PTI [ 22.468492][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc2-next-20250819-00042-g7692ca4ea522 #1 PREEMPT(voluntary) [ 22.468492][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 22.468492][ T1] RIP: 0010:serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:740) [ 22.468492][ T1] Code: 49 89 86 a0 01 00 00 48 8b 83 90 01 00 00 48 8b 8b 98 01 00 00 49 89 8e 98 01 00 00 49 89 86 90 01 00 00 48 8b 83 80 02 00 00 <48> 8b 40 28 49 8b 8e 80 02 00 00 48 89 41 28 48 8b 83 80 02 00 00 All code ======== 0: 49 89 86 a0 01 00 00 mov %rax,0x1a0(%r14) 7: 48 8b 83 90 01 00 00 mov 0x190(%rbx),%rax e: 48 8b 8b 98 01 00 00 mov 0x198(%rbx),%rcx 15: 49 89 8e 98 01 00 00 mov %rcx,0x198(%r14) 1c: 49 89 86 90 01 00 00 mov %rax,0x190(%r14) 23: 48 8b 83 80 02 00 00 mov 0x280(%rbx),%rax 2a:* 48 8b 40 28 mov 0x28(%rax),%rax <-- trapping instruction 2e: 49 8b 8e 80 02 00 00 mov 0x280(%r14),%rcx 35: 48 89 41 28 mov %rax,0x28(%rcx) 39: 48 8b 83 80 02 00 00 mov 0x280(%rbx),%rax Code starting with the faulting instruction =========================================== 0: 48 8b 40 28 mov 0x28(%rax),%rax 4: 49 8b 8e 80 02 00 00 mov 0x280(%r14),%rcx b: 48 89 41 28 mov %rax,0x28(%rcx) f: 48 8b 83 80 02 00 00 mov 0x280(%rbx),%rax [ 22.468492][ T1] RSP: 0000:ffffcf4f000136a8 EFLAGS: 00010202 [ 22.468492][ T1] RAX: 0000000000000000 RBX: ffffcf4f000136d0 RCX: 0000000000000000 [ 22.468492][ T1] RDX: 0000000000000000 RSI: ffffcf4f000136d0 RDI: ffffffffaf293700 [ 22.468492][ T1] RBP: 0000000000000001 R08: 0000000000000401 R09: 0000000000000000 [ 22.468492][ T1] R10: ffffcf4f000136d0 R11: ffffffffacfecab0 R12: ffff8e5b417916a0 [ 22.468492][ T1] R13: ffffcf4f00013a98 R14: ffffffffaf293700 R15: 00000000ffffffed [ 22.468492][ T1] FS: 0000000000000000(0000) GS:ffff8e5ec0c2e000(0000) knlGS:0000000000000000 [ 22.468492][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.468492][ T1] CR2: 0000000000000028 CR3: 00000002b9620000 CR4: 00000000000406f0 [ 22.468492][ T1] Call Trace: [ 22.468492][ T1] [ 22.468492][ T1] serial_pnp_probe (drivers/tty/serial/8250/8250_pnp.c:480) [ 22.468492][ T1] pnp_device_probe (drivers/pnp/driver.c:113) [ 22.468492][ T1] really_probe (drivers/base/dd.c:583) [ 22.468492][ T1] __driver_probe_device (drivers/base/dd.c:?) [ 22.468492][ T1] driver_probe_device (drivers/base/dd.c:831) [ 22.468492][ T1] __driver_attach (drivers/base/dd.c:1218) [ 22.468492][ T1] ? driver_attach (drivers/base/dd.c:1158) [ 22.468492][ T1] bus_for_each_dev (drivers/base/bus.c:369) [ 22.468492][ T1] bus_add_driver (drivers/base/bus.c:678) [ 22.468492][ T1] driver_register (drivers/base/driver.c:250) [ 22.468492][ T1] serial8250_init (drivers/tty/serial/8250/8250_platform.c:322) [ 22.468492][ T1] ? __serial8250_isa_init_ports (drivers/tty/serial/8250/8250_platform.c:302) [ 22.468492][ T1] do_one_initcall (init/main.c:1281) [ 22.468492][ T1] ? chacha_block_generic (lib/crypto/chacha.c:86) [ 22.468492][ T1] ? crng_fast_key_erasure (include/linux/string.h:366 drivers/char/random.c:330) [ 22.468492][ T1] ? crng_make_state (include/linux/spinlock.h:406 drivers/char/random.c:363) [ 22.468492][ T1] ? get_random_u32 (include/linux/string.h:366 include/crypto/chacha.h:119 drivers/char/random.c:425 drivers/char/random.c:554) [ 22.468492][ T1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050) [ 22.468492][ T1] ? asm_sysvec_apic_timer_interrupt (arch/x86/include/asm/idtentry.h:702) [ 22.468492][ T1] ? parameq (kernel/params.c:? kernel/params.c:91 kernel/params.c:99) [ 22.468492][ T1] ? parameq (kernel/params.c:90 kernel/params.c:99) [ 22.468492][ T1] ? do_initcall_level (init/main.c:1327) [ 22.468492][ T1] ? parse_args (kernel/params.c:153) [ 22.468492][ T1] do_initcall_level (init/main.c:1342) [ 22.468492][ T1] do_initcalls (init/main.c:1356) [ 22.468492][ T1] kernel_init_freeable (init/main.c:1593) [ 22.468492][ T1] ? rest_init (init/main.c:1473) [ 22.468492][ T1] kernel_init (init/main.c:1483) [ 22.468492][ T1] ret_from_fork (arch/x86/kernel/process.c:154) [ 22.468492][ T1] ? rest_init (init/main.c:1473) [ 22.468492][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) [ 22.468492][ T1] [ 22.468492][ T1] Modules linked in: [ 22.468492][ T1] CR2: 0000000000000028 [ 22.468492][ T1] ---[ end trace 0000000000000000 ]--- [ 22.468492][ T1] RIP: 0010:serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:740) [ 22.468492][ T1] Code: 49 89 86 a0 01 00 00 48 8b 83 90 01 00 00 48 8b 8b 98 01 00 00 49 89 8e 98 01 00 00 49 89 86 90 01 00 00 48 8b 83 80 02 00 00 <48> 8b 40 28 49 8b 8e 80 02 00 00 48 89 41 28 48 8b 83 80 02 00 00 All code ======== 0: 49 89 86 a0 01 00 00 mov %rax,0x1a0(%r14) 7: 48 8b 83 90 01 00 00 mov 0x190(%rbx),%rax e: 48 8b 8b 98 01 00 00 mov 0x198(%rbx),%rcx 15: 49 89 8e 98 01 00 00 mov %rcx,0x198(%r14) 1c: 49 89 86 90 01 00 00 mov %rax,0x190(%r14) 23: 48 8b 83 80 02 00 00 mov 0x280(%rbx),%rax 2a:* 48 8b 40 28 mov 0x28(%rax),%rax <-- trapping instruction 2e: 49 8b 8e 80 02 00 00 mov 0x280(%r14),%rcx 35: 48 89 41 28 mov %rax,0x28(%rcx) 39: 48 8b 83 80 02 00 00 mov 0x280(%rbx),%rax Code starting with the faulting instruction =========================================== 0: 48 8b 40 28 mov 0x28(%rax),%rax 4: 49 8b 8e 80 02 00 00 mov 0x280(%r14),%rcx b: 48 89 41 28 mov %rax,0x28(%rcx) f: 48 8b 83 80 02 00 00 mov 0x280(%rbx),%rax The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250829/202508291640.97e82aad-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki