[syzbot] [kernel?] BUG: unable to handle kernel paging request in find_lock_lowest_rq

syzbot
2024-07-31T23:30:31Z

Hello,

syzbot found the following issue on:

HEAD commit: 22f546873149 minmax: improve macro expansion and type chec..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17688f9d980000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b0cca2f3880513d
dashboard link: https://syzkaller.appspot.com/bug?extid=54ac85e4189aac460540
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9e475c4ebb27/disk-22f54687.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/333e92710b31/vmlinux-22f54687.xz
kernel image: https://storage.googleapis.com/syzbot-assets/830d57b60fec/bzImage-22f54687.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+54ac85e4189aac460540@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: fffffbfff459d822
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffe4067 P4D 23ffe4067 PUD 23ffe3067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 15194 Comm: syz.4.1359 Not tainted 6.11.0-rc1-syzkaller-00044-g22f546873149 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189
Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00
RSP: 0018:ffffc9000396f820 EFLAGS: 00010086
RAX: 0000000001eb8501 RBX: 1ffffffff459d822 RCX: ffffffff816fbdab
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffffa2cec110
RBP: ffffffffffffffff R08: ffffffffa2cec117 R09: 1ffffffff459d822
R10: dffffc0000000000 R11: fffffbfff459d822 R12: ffff88802fa8bc00
R13: ffff88802fa8c6d8 R14: dffffc0000000001 R15: fffffbfff459d823
FS: 000055556b4f9500(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff459d822 CR3: 000000007857a000 CR4: 0000000000350ef0
Call Trace:
<TASK>
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
__lock_acquire+0xc8b/0x2040 kernel/locking/lockdep.c:5112
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560
_double_lock_balance kernel/sched/sched.h:2760 [inline]
double_lock_balance kernel/sched/sched.h:2805 [inline]
find_lock_lowest_rq+0x1e1/0x670 kernel/sched/rt.c:1941
push_rt_task+0x13f/0x7e0 kernel/sched/rt.c:2074
push_rt_tasks kernel/sched/rt.c:2124 [inline]
task_woken_rt+0x14c/0x220 kernel/sched/rt.c:2424
ttwu_do_activate+0x338/0x7e0 kernel/sched/core.c:3594
ttwu_queue kernel/sched/core.c:3846 [inline]
try_to_wake_up+0x884/0x1470 kernel/sched/core.c:4167
signal_wake_up_state+0xb4/0x120 kernel/signal.c:773
signal_wake_up include/linux/sched/signal.h:448 [inline]
zap_other_threads+0x2fd/0x3e0 kernel/signal.c:1384
do_group_exit+0x18a/0x2c0 kernel/exit.c:1026
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f422eb773b9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe323e3558 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f422eb773b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe323e35ac R08: 0000000000000006 R09: 0000000000133833
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 0000000000133833 R14: 0000000000133449 R15: 00007ffe323e3600
</TASK>
Modules linked in:
CR2: fffffbfff459d822
---[ end trace 0000000000000000 ]---
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189
Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00
RSP: 0018:ffffc9000396f820 EFLAGS: 00010086
RAX: 0000000001eb8501 RBX: 1ffffffff459d822 RCX: ffffffff816fbdab
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffffa2cec110
RBP: ffffffffffffffff R08: ffffffffa2cec117 R09: 1ffffffff459d822
R10: dffffc0000000000 R11: fffffbfff459d822 R12: ffff88802fa8bc00
R13: ffff88802fa8c6d8 R14: dffffc0000000001 R15: fffffbfff459d823
FS: 000055556b4f9500(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff459d822 CR3: 000000007857a000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 7 bytes skipped:
0: df 4f 8d fisttps -0x73(%rdi)
3: 3c 31 cmp $0x31,%al
5: 4c 89 fd mov %r15,%rbp
8: 4c 29 dd sub %r11,%rbp
b: 48 83 fd 10 cmp $0x10,%rbp
f: 7f 29 jg 0x3a
11: 48 85 ed test %rbp,%rbp
14: 0f 84 3e 01 00 00 je 0x158
1a: 4c 89 cd mov %r9,%rbp
1d: 48 f7 d5 not %rbp
20: 48 01 dd add %rbx,%rbp
* 23: 41 80 3b 00 cmpb $0x0,(%r11) <-- trapping instruction
27: 0f 85 c9 01 00 00 jne 0x1f6
2d: 49 ff c3 inc %r11
30: 48 ff c5 inc %rbp
33: 75 ee jne 0x23
35: e9 .byte 0xe9
36: 1e (bad)
37: 01 00 add %eax,(%rax)

---
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