RBP: 00007fffb62bffa0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb62c1070 R13: 00007fed9ee9265d R14: 000000000002f57c R15: 0000000000000006 ---[ end trace b8d02d071cb4a91f ]--- ================================================================== BUG: KASAN: null-ptr-deref in atomic_add_return include/asm-generic/atomic-instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic-fallback.h:284 [inline] BUG: KASAN: null-ptr-deref in ihold+0x1b/0x50 fs/inode.c:421 Write of size 4 at addr 0000000000000160 by task syz-executor/4714 CPU: 0 PID: 4714 Comm: syz-executor Tainted: G W 5.4.276-syzkaller-00021-g58de09405d1e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 __kasan_report+0xe9/0x120 mm/kasan/report.c:520 kasan_report+0x30/0x60 mm/kasan/common.c:653 check_memory_region_inline mm/kasan/generic.c:141 [inline] check_memory_region+0x272/0x280 mm/kasan/generic.c:191 atomic_add_return include/asm-generic/atomic-instrumented.h:71 [inline] atomic_inc_return include/linux/atomic-fallback.h:284 [inline] ihold+0x1b/0x50 fs/inode.c:421 d_delete_notify include/linux/fsnotify.h:221 [inline] vfs_rmdir+0x1e0/0x3c0 fs/namei.c:4040 incfs_kill_sb+0x105/0x200 fs/incfs/vfs.c:1944 deactivate_locked_super+0xa8/0x110 fs/super.c:335 deactivate_super+0x1e2/0x2a0 fs/super.c:366 cleanup_mnt+0x44e/0x500 fs/namespace.c:1102 task_work_run+0x140/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x190/0x1a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fed9ee26247 Code: a8 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 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fffb62bfee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fed9ee26247 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb62bffa0 RBP: 00007fffb62bffa0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb62c1070 R13: 00007fed9ee9265d R14: 000000000002f57c R15: 0000000000000006 ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000160 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1ebde2067 P4D 1ebde2067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 4714 Comm: syz-executor Tainted: G B W 5.4.276-syzkaller-00021-g58de09405d1e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:167 [inline] RIP: 0010:atomic_add_return include/asm-generic/atomic-instrumented.h:72 [inline] RIP: 0010:atomic_inc_return include/linux/atomic-fallback.h:284 [inline] RIP: 0010:ihold+0x20/0x50 fs/inode.c:421 Code: 0f 1f 84 00 00 00 00 00 66 90 55 53 48 89 fb e8 36 da c2 ff 48 8d bb 60 01 00 00 be 04 00 00 00 e8 b5 92 f2 ff bd 01 00 00 00 0f c1 ab 60 01 00 00 ff c5 bf 02 00 00 00 89 ee e8 fa dc c2 ff RSP: 0018:ffff8881e7df7ca0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881e2380000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff RBP: 0000000000000001 R08: ffffffff813ae585 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8881e4c3a310 R15: 0000000000000000 FS: 00005555574e5500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000160 CR3: 00000001ddf2f000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_delete_notify include/linux/fsnotify.h:221 [inline] vfs_rmdir+0x1e0/0x3c0 fs/namei.c:4040 incfs_kill_sb+0x105/0x200 fs/incfs/vfs.c:1944 deactivate_locked_super+0xa8/0x110 fs/super.c:335 deactivate_super+0x1e2/0x2a0 fs/super.c:366 cleanup_mnt+0x44e/0x500 fs/namespace.c:1102 task_work_run+0x140/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x190/0x1a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fed9ee26247 Code: a8 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 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fffb62bfee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fed9ee26247 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb62bffa0 RBP: 00007fffb62bffa0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb62c1070 R13: 00007fed9ee9265d R14: 000000000002f57c R15: 0000000000000006 Modules linked in: CR2: 0000000000000160 ---[ end trace b8d02d071cb4a920 ]--- RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:167 [inline] RIP: 0010:atomic_add_return include/asm-generic/atomic-instrumented.h:72 [inline] RIP: 0010:atomic_inc_return include/linux/atomic-fallback.h:284 [inline] RIP: 0010:ihold+0x20/0x50 fs/inode.c:421 Code: 0f 1f 84 00 00 00 00 00 66 90 55 53 48 89 fb e8 36 da c2 ff 48 8d bb 60 01 00 00 be 04 00 00 00 e8 b5 92 f2 ff bd 01 00 00 00 0f c1 ab 60 01 00 00 ff c5 bf 02 00 00 00 89 ee e8 fa dc c2 ff RSP: 0018:ffff8881e7df7ca0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881e2380000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff RBP: 0000000000000001 R08: ffffffff813ae585 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8881e4c3a310 R15: 0000000000000000 FS: 00005555574e5500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000160 CR3: 00000001ddf2f000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 66 90 xchg %ax,%ax a: 55 push %rbp b: 53 push %rbx c: 48 89 fb mov %rdi,%rbx f: e8 36 da c2 ff call 0xffc2da4a 14: 48 8d bb 60 01 00 00 lea 0x160(%rbx),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 b5 92 f2 ff call 0xfff292da 25: bd 01 00 00 00 mov $0x1,%ebp * 2a: f0 0f c1 ab 60 01 00 lock xadd %ebp,0x160(%rbx) <-- trapping instruction 31: 00 32: ff c5 inc %ebp 34: bf 02 00 00 00 mov $0x2,%edi 39: 89 ee mov %ebp,%esi 3b: e8 fa dc c2 ff call 0xffc2dd3a