Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc2f548e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f90cc56a1d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2f548f10
RBP: 00007ffc2f548f10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc2f54a000
R13: 00007f90cc5b43b9 R14: 0000000000009f7c R15: 0000000000000006
---[ end trace f27d799b85389db5 ]---
==================================================================
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:426
Write of size 4 at addr 0000000000000170 by task syz-executor.0/348
CPU: 0 PID: 348 Comm: syz-executor.0 Tainted: G W 5.15.149-syzkaller-1069109-g5d96939590c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
__kasan_report mm/kasan/report.c:431 [inline]
kasan_report+0x16f/0x1c0 mm/kasan/report.c:444
kasan_check_range+0x293/0x2a0 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:426
d_delete_notify include/linux/fsnotify.h:267 [inline]
vfs_rmdir+0x201/0x470 fs/namei.c:4162
incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1961
deactivate_locked_super+0xad/0x110 fs/super.c:335
deactivate_super+0xbe/0xf0 fs/super.c:366
cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
__cleanup_mnt+0x19/0x20 fs/namespace.c:1150
task_work_run+0x129/0x190 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f90cc56a1d7
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc2f548e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f90cc56a1d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2f548f10
RBP: 00007ffc2f548f10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc2f54a000
R13: 00007f90cc5b43b9 R14: 0000000000009f7c R15: 0000000000000006
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1261c4067 P4D 1261c4067 PUD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 348 Comm: syz-executor.0 Tainted: G B W 5.15.149-syzkaller-1069109-g5d96939590c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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+0x25/0x60 fs/inode.c:426
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 d1 df ae ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 b0 f0 f0 ff bb 01 00 00 00 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 54 e3 ae
RSP: 0018:ffffc90000a57cc8 EFLAGS: 00010246
RAX: ffff88810c8c3b00 RBX: 0000000000000001 RCX: ffff88810c8c3b40
RDX: 0000000000000000 RSI: 0000000000000286 RDI: 00000000ffffffff
RBP: ffffc90000a57cd8 R08: ffffffff81416f3b R09: 0000000000000003
R10: fffffbfff0d9244c R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811d266330 R14: 0000000000000000 R15: 1ffff11023a4cc6c
FS: 0000555556087480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000126171000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
d_delete_notify include/linux/fsnotify.h:267 [inline]
vfs_rmdir+0x201/0x470 fs/namei.c:4162
incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1961
deactivate_locked_super+0xad/0x110 fs/super.c:335
deactivate_super+0xbe/0xf0 fs/super.c:366
cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
__cleanup_mnt+0x19/0x20 fs/namespace.c:1150
task_work_run+0x129/0x190 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f90cc56a1d7
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc2f548e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f90cc56a1d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2f548f10
RBP: 00007ffc2f548f10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc2f54a000
R13: 00007f90cc5b43b9 R14: 0000000000009f7c R15: 0000000000000006
Modules linked in:
CR2: 0000000000000170
---[ end trace f27d799b85389db6 ]---
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+0x25/0x60 fs/inode.c:426
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 d1 df ae ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 b0 f0 f0 ff bb 01 00 00 00 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 54 e3 ae
RSP: 0018:ffffc90000a57cc8 EFLAGS: 00010246
RAX: ffff88810c8c3b00 RBX: 0000000000000001 RCX: ffff88810c8c3b40
RDX: 0000000000000000 RSI: 0000000000000286 RDI: 00000000ffffffff
RBP: ffffc90000a57cd8 R08: ffffffff81416f3b R09: 0000000000000003
R10: fffffbfff0d9244c R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811d266330 R14: 0000000000000000 R15: 1ffff11023a4cc6c
FS: 0000555556087480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 0000000126171000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
0: ff f7 push %rdi
2: d8 64 89 01 fsubs 0x1(%rcx,%rcx,4)
6: 48 83 c8 ff or $0xffffffffffffffff,%rax
a: c3 ret
b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
10: 31 f6 xor %esi,%esi
12: e9 09 00 00 00 jmp 0x20
17: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
1e: 00 00
20: b8 a6 00 00 00 mov $0xa6,%eax
25: 0f 05 syscall
* 27: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
2d: 77 01 ja 0x30
2f: c3 ret
30: 48 c7 c2 b0 ff ff ff mov $0xffffffffffffffb0,%rdx
37: f7 d8 neg %eax
39: 64 89 02 mov %eax,%fs:(%rdx)
3c: b8 .byte 0xb8