RBP: 0000000000000016 R08: 00007ffd3d766226 R09: 00007ffd3d769740
R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd3d769740
R13: 00007ff47d3f0925 R14: 000055556e9594a8 R15: 00007ffd3d76b900
---[ end trace 6929fa32e68e410e ]---
==================================================================
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-executor/285
CPU: 0 PID: 285 Comm: syz-executor Tainted: G W 5.15.185-syzkaller-00178-g5cf73bface18 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0xa76/0x27a0 kernel/exit.c:880
do_group_exit+0x141/0x310 kernel/exit.c:1002
__do_sys_exit_group kernel/exit.c:1013 [inline]
__se_sys_exit_group kernel/exit.c:1011 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff47d36e929
Code: Unable to access opcode bytes at RIP 0x7ff47d36e8ff.
RSP: 002b:00007ffd3d768488 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ff47d3f0997 RCX: 00007ff47d36e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000016 R08: 00007ffd3d766226 R09: 00007ffd3d769740
R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd3d769740
R13: 00007ff47d3f0925 R14: 000055556e9594a8 R15: 00007ffd3d76b900
==================================================================
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: 285 Comm: syz-executor Tainted: G B W 5.15.185-syzkaller-00178-g5cf73bface18 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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 31 bb b3 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 50 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 b1
RSP: 0018:ffffc90000a27b68 EFLAGS: 00010246
RAX: ffff88811da82700 RBX: 0000000000000000 RCX: ffff88811da82780
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90000a27b78 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0e17a4c R11: 1ffffffff0e17a4c R12: 1ffff110252c09e2
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010fbed000 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
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0xa76/0x27a0 kernel/exit.c:880
do_group_exit+0x141/0x310 kernel/exit.c:1002
__do_sys_exit_group kernel/exit.c:1013 [inline]
__se_sys_exit_group kernel/exit.c:1011 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011
x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff47d36e929
Code: Unable to access opcode bytes at RIP 0x7ff47d36e8ff.
RSP: 002b:00007ffd3d768488 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ff47d3f0997 RCX: 00007ff47d36e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000016 R08: 00007ffd3d766226 R09: 00007ffd3d769740
R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd3d769740
R13: 00007ff47d3f0925 R14: 000055556e9594a8 R15: 00007ffd3d76b900
Modules linked in:
CR2: 0000000000000170
---[ end trace 6929fa32e68e410f ]---
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 31 bb b3 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 50 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 b1
RSP: 0018:ffffc90000a27b68 EFLAGS: 00010246
RAX: ffff88811da82700 RBX: 0000000000000000 RCX: ffff88811da82780
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90000a27b78 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0e17a4c R11: 1ffffffff0e17a4c R12: 1ffff110252c09e2
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010fbed000 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 31 bb b3 ff call 0xffb3bb44
13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi
1a: be 04 00 00 00 mov $0x4,%esi
1f: e8 50 33 f2 ff call 0xfff23374
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: b1 .byte 0xb1