syzbot
general protection fault in tracing_release_file_tr
Status:
premoderation: reported on 2026/08/03 03:11
Reported-by: syzbot+4e792a64f415ff18f366@syzkaller.appspotmail.com
First crash: 26d, last: 5d23h
Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 PID: 2538 Comm: syz.0.611 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:tracing_release_file_tr+0x48/0x100 kernel/trace/trace.c:4499
Code: 81 c3 a8 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 76 19 37 00 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 59 19 37 00 48 8b 1b 48 85 db 74
RSP: 0018:ffffc9000137fdd8 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff88810ce2e2c0
RDX: 0000000000000000 RSI: ffff888115a3af00 RDI: ffff8881316a2a40
RBP: ffffc9000137fdf8 R08: ffffc9000137fd6f R09: ffffc9000137fd40
R10: dffffc0000000000 R11: fffff5200026ffae R12: ffff888115a3af00
R13: ffff8881316a2a40 R14: 1ffff11022b475e5 R15: dffffc0000000000
FS: 000055557134c500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002c0 CR3: 0000000131f01000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__fput+0x2dc/0x730 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x127/0x190 kernel/task_work.c:189
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6ad6dcf0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff7ea6b128 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff7ea6b210 RCX: 00007f6ad6dcf0d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000182d5 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2de20000 R11: 0000000000000246 R12: 00007fff7ea6b250
R13: 00007f6ad7056fac R14: 000000000001836f R15: 00007f6ad7056fa0
Modules linked in:
---[ end trace 7b829a80d5482bec ]---
RIP: 0010:tracing_release_file_tr+0x48/0x100 kernel/trace/trace.c:4499
Code: 81 c3 a8 02 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 76 19 37 00 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 59 19 37 00 48 8b 1b 48 85 db 74
RSP: 0018:ffffc9000137fdd8 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff88810ce2e2c0
RDX: 0000000000000000 RSI: ffff888115a3af00 RDI: ffff8881316a2a40
RBP: ffffc9000137fdf8 R08: ffffc9000137fd6f R09: ffffc9000137fd40
R10: dffffc0000000000 R11: fffff5200026ffae R12: ffff888115a3af00
R13: ffff8881316a2a40 R14: 1ffff11022b475e5 R15: dffffc0000000000
FS: 000055557134c500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fef3eac1bd0 CR3: 0000000131f01000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 81 c3 a8 02 00 00 add $0x2a8,%ebx
6: 48 89 d8 mov %rbx,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
12: 74 08 je 0x1c
14: 48 89 df mov %rbx,%rdi
17: e8 76 19 37 00 call 0x371992
1c: 48 8b 1b mov (%rbx),%rbx
1f: 48 83 c3 28 add $0x28,%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 59 19 37 00 call 0x371992
39: 48 8b 1b mov (%rbx),%rbx
3c: 48 85 db test %rbx,%rbx
3f: 74 .byte 0x74
* Struck through repros no longer work on HEAD.