Code: bf 41 4d 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 e4 03 09 00 00 00 00 00 eb 96 e8 d1 05 00 00 90 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff012bbdf8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff825f2d6a7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff012bbeb0
RBP: 00007fff012bbeb0 R08: 00007fff012bceb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff012bcf20
R13: 0000555581b247e0 R14: 431bde82d7b634db R15: 00007fff012bcf40
---[ end trace 12e9d51af9fcc2c6 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:454
Write of size 4 at addr 0000000000000170 by task syz-executor675/304
CPU: 0 PID: 304 Comm: syz-executor675 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
__kasan_report mm/kasan/report.c:431 [inline]
kasan_report+0xcc/0x150 mm/kasan/report.c:444
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
__kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
atomic_inc_return include/linux/atomic/atomic-instrumented.h:188 [inline]
ihold+0x20/0x60 fs/inode.c:454
d_delete_notify include/linux/fsnotify.h:275 [inline]
vfs_rmdir+0x23d/0x450 fs/namei.c:4170
incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1991
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
__cleanup_mnt+0x19/0x20 fs/namespace.c:1156
task_work_run+0x127/0x190 kernel/task_work.c:188
ptrace_notify+0x230/0x270 kernel/signal.c:2404
ptrace_report_syscall include/linux/tracehook.h:66 [inline]
tracehook_report_syscall_exit include/linux/tracehook.h:130 [inline]
arch_syscall_exit_tracehook include/linux/entry-common.h:297 [inline]
syscall_exit_work+0x87/0x160 kernel/entry/common.c:265
syscall_exit_to_user_mode_prepare+0x1c/0x20 kernel/entry/common.c:292
__syscall_exit_to_user_mode_work kernel/entry/common.c:297 [inline]
syscall_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:310
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff825f2d6a7
Code: bf 41 4d 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 e4 03 09 00 00 00 00 00 eb 96 e8 d1 05 00 00 90 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff012bbdf8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff825f2d6a7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff012bbeb0
RBP: 00007fff012bbeb0 R08: 00007fff012bceb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff012bcf20
R13: 0000555581b247e0 R14: 431bde82d7b634db R15: 00007fff012bcf40
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 304 Comm: syz-executor675 Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:454
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 b1 60 b2 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 20 fd f1 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 31
RSP: 0018:ffffc900007b7c10 EFLAGS: 00010246
RAX: ffff88810abba800 RBX: 0000000000000000 RCX: ffff88810abba800
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc900007b7c20 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e1904c R12: 1ffff110244a0a8e
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555581b23480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000120cec000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:275 [inline]
vfs_rmdir+0x23d/0x450 fs/namei.c:4170
incfs_kill_sb+0xfe/0x210 fs/incfs/vfs.c:1991
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
__cleanup_mnt+0x19/0x20 fs/namespace.c:1156
task_work_run+0x127/0x190 kernel/task_work.c:188
ptrace_notify+0x230/0x270 kernel/signal.c:2404
ptrace_report_syscall include/linux/tracehook.h:66 [inline]
tracehook_report_syscall_exit include/linux/tracehook.h:130 [inline]
arch_syscall_exit_tracehook include/linux/entry-common.h:297 [inline]
syscall_exit_work+0x87/0x160 kernel/entry/common.c:265
syscall_exit_to_user_mode_prepare+0x1c/0x20 kernel/entry/common.c:292
__syscall_exit_to_user_mode_work kernel/entry/common.c:297 [inline]
syscall_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:310
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff825f2d6a7
Code: bf 41 4d 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 e4 03 09 00 00 00 00 00 eb 96 e8 d1 05 00 00 90 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff012bbdf8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff825f2d6a7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff012bbeb0
RBP: 00007fff012bbeb0 R08: 00007fff012bceb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff012bcf20
R13: 0000555581b247e0 R14: 431bde82d7b634db R15: 00007fff012bcf40
Modules linked in:
CR2: 0000000000000170
---[ end trace 12e9d51af9fcc2c7 ]---
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:370 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:189 [inline]
RIP: 0010:ihold+0x26/0x60 fs/inode.c:454
Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 b1 60 b2 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 20 fd f1 ff 41 be 01 00 00 00 44 0f c1 b3 70 01 00 00 41 ff c6 bf 02 00 00 00 44 89 f6 e8 31
RSP: 0018:ffffc900007b7c10 EFLAGS: 00010246
RAX: ffff88810abba800 RBX: 0000000000000000 RCX: ffff88810abba800
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc900007b7c20 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e1904c R12: 1ffff110244a0a8e
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555581b23480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000120cec000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: bf 41 4d 56 53 mov $0x53564d41,%edi
5: b8 9d 00 00 00 mov $0x9d,%eax
a: 0f 05 syscall
c: 83 f8 ea cmp $0xffffffea,%eax
f: 75 a2 jne 0xffffffb3
11: c7 05 e4 03 09 00 00 movl $0x0,0x903e4(%rip) # 0x903ff
18: 00 00 00
1b: eb 96 jmp 0xffffffb3
1d: e8 d1 05 00 00 call 0x5f3
22: 90 nop
23: b8 a6 00 00 00 mov $0xa6,%eax
28: 0f 05 syscall
* 2a: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 01 ja 0x33
32: c3 ret
33: 48 c7 c2 d8 ff ff ff mov $0xffffffffffffffd8,%rdx
3a: f7 d8 neg %eax
3c: 64 89 02 mov %eax,%fs:(%rdx)
3f: b8 .byte 0xb8