RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcff35c8a0
RBP: 00007ffcff35c8a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffcff35d910
R13: 000055555aecc6c0 R14: 00007ffcff35d910 R15: 0000000000000001
---[ end trace 4cf7726aaf81f9f0 ]---
==================================================================
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-executor328/289
CPU: 1 PID: 289 Comm: syz-executor328 Tainted: G W 5.15.189-syzkaller-android13-5.15.189_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
__kasan_report mm/kasan/report.c:431 [inline]
kasan_report+0xe7/0x140 mm/kasan/report.c:444
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x280/0x290 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+0x1f0/0x460 fs/namei.c:4162
incfs_kill_sb+0x105/0x220 fs/incfs/vfs.c:1989
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x446/0x500 fs/namespace.c:1139
__cleanup_mnt+0x19/0x20 fs/namespace.c:1146
task_work_run+0x127/0x190 kernel/task_work.c:188
ptrace_notify+0x212/0x250 kernel/signal.c:2391
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:262
syscall_exit_to_user_mode_prepare+0x1c/0x20 kernel/entry/common.c:289
__syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
syscall_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8336e11ac7
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcff35c7e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8336e11ac7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcff35c8a0
RBP: 00007ffcff35c8a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffcff35d910
R13: 000055555aecc6c0 R14: 00007ffcff35d910 R15: 0000000000000001
==================================================================
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: 1 PID: 289 Comm: syz-executor328 Tainted: G B W 5.15.189-syzkaller-android13-5.15.189_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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 61 b6 b3 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 30 33 f2 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 e1
RSP: 0018:ffffc90000977be8 EFLAGS: 00010246
RAX: ffff888106f8a700 RBX: 0000000000000000 RCX: ffff888106f8a780
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90000977bf8 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0e1804c R11: 1ffffffff0e1804c R12: 1ffff11021238bc0
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 000055555aecb380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000125aa6000 CR4: 00000000003506a0
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+0x1f0/0x460 fs/namei.c:4162
incfs_kill_sb+0x105/0x220 fs/incfs/vfs.c:1989
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x446/0x500 fs/namespace.c:1139
__cleanup_mnt+0x19/0x20 fs/namespace.c:1146
task_work_run+0x127/0x190 kernel/task_work.c:188
ptrace_notify+0x212/0x250 kernel/signal.c:2391
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:262
syscall_exit_to_user_mode_prepare+0x1c/0x20 kernel/entry/common.c:289
__syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
syscall_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8336e11ac7
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcff35c7e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8336e11ac7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcff35c8a0
RBP: 00007ffcff35c8a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffcff35d910
R13: 000055555aecc6c0 R14: 00007ffcff35d910 R15: 0000000000000001
Modules linked in:
CR2: 0000000000000170
---[ end trace 4cf7726aaf81f9f1 ]---
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 61 b6 b3 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 30 33 f2 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 e1
RSP: 0018:ffffc90000977be8 EFLAGS: 00010246
RAX: ffff888106f8a700 RBX: 0000000000000000 RCX: ffff888106f8a780
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90000977bf8 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0e1804c R11: 1ffffffff0e1804c R12: 1ffff11021238bc0
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 000055555aecb380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000125aa6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 55 push %rbp
5: 48 89 e5 mov %rsp,%rbp
8: 41 56 push %r14
a: 53 push %rbx
b: 48 89 fb mov %rdi,%rbx
e: e8 61 b6 b3 ff call 0xffb3b674
13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi
1a: be 04 00 00 00 mov $0x4,%esi
1f: e8 30 33 f2 ff call 0xfff23354
24: 41 be 01 00 00 00 mov $0x1,%r14d
* 2a: f0 44 0f c1 b3 70 01 lock xadd %r14d,0x170(%rbx) <-- trapping instruction
31: 00 00
33: 41 ff c6 inc %r14d
36: bf 02 00 00 00 mov $0x2,%edi
3b: 44 89 f6 mov %r14d,%esi
3e: e8 .byte 0xe8
3f: e1 .byte 0xe1