RSP: 002b:00007ffd0825ea68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fcc6e406ac7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd0825eb20 RBP: 00007ffd0825eb20 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffd0825fc10 R13: 0000555564232700 R14: 00007ffd08260c80 R15: 0000000000000001 ---[ end trace 81a835f42a8990a0 ]--- ================================================================== 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:451 Write of size 4 at addr 0000000000000170 by task syz-executor211/289 CPU: 1 PID: 289 Comm: syz-executor211 Tainted: G W 5.15.184-syzkaller-00129-g4032a894ccb2 #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:451 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:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 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: 0033:0x7fcc6e406ac7 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:00007ffd0825ea68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fcc6e406ac7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd0825eb20 RBP: 00007ffd0825eb20 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffd0825fc10 R13: 0000555564232700 R14: 00007ffd08260c80 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-executor211 Tainted: G B W 5.15.184-syzkaller-00129-g4032a894ccb2 #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:451 Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 c1 c1 b3 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 40 35 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 41 RSP: 0018:ffffc90000957be8 EFLAGS: 00010246 RAX: ffff8881055d4f00 RBX: 0000000000000000 RCX: ffff8881055d4f00 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff RBP: ffffc90000957bf8 R08: 0000000000000004 R09: 0000000000000003 R10: fffffbfff0e17a4c R11: 1ffffffff0e17a4c R12: 1ffff1102403d1e2 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000555564229380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 0000000121579000 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:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 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: 0033:0x7fcc6e406ac7 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:00007ffd0825ea68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fcc6e406ac7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd0825eb20 RBP: 00007ffd0825eb20 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffd0825fc10 R13: 0000555564232700 R14: 00007ffd08260c80 R15: 0000000000000001 Modules linked in: CR2: 0000000000000170 ---[ end trace 81a835f42a8990a1 ]--- 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:451 Code: 00 00 00 00 55 48 89 e5 41 56 53 48 89 fb e8 c1 c1 b3 ff 48 8d bb 70 01 00 00 be 04 00 00 00 e8 40 35 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 41 RSP: 0018:ffffc90000957be8 EFLAGS: 00010246 RAX: ffff8881055d4f00 RBX: 0000000000000000 RCX: ffff8881055d4f00 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00000000ffffffff RBP: ffffc90000957bf8 R08: 0000000000000004 R09: 0000000000000003 R10: fffffbfff0e17a4c R11: 1ffffffff0e17a4c R12: 1ffff1102403d1e2 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000555564229380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 0000000121579000 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 c1 c1 b3 ff call 0xffb3c1d4 13: 48 8d bb 70 01 00 00 lea 0x170(%rbx),%rdi 1a: be 04 00 00 00 mov $0x4,%esi 1f: e8 40 35 f2 ff call 0xfff23564 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: 41 rex.B