R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd29528a50 R13: 00007fc7dce1c3b9 R14: 0000555555a7f430 R15: 000000000000000e ---[ end trace 303c06e88ea05663 ]--- ================================================================== 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/asm-generic/atomic-instrumented.h:250 [inline] BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:423 Write of size 4 at addr 0000000000000170 by task syz-executor.4/12940 CPU: 0 PID: 12940 Comm: syz-executor.4 Tainted: G W 5.10.210-syzkaller-00394-g70b6ab09a34b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:439 [inline] kasan_report+0x167/0x1c0 mm/kasan/report.c:452 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/asm-generic/atomic-instrumented.h:250 [inline] ihold+0x20/0x60 fs/inode.c:423 d_delete_notify include/linux/fsnotify.h:258 [inline] vfs_rmdir+0x200/0x3f0 fs/namei.c:3865 incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1945 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x129/0x190 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc83/0x2a50 kernel/exit.c:861 do_group_exit+0x141/0x310 kernel/exit.c:983 __do_sys_exit_group kernel/exit.c:994 [inline] __se_sys_exit_group kernel/exit.c:992 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:992 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fc7dcdd1ca9 Code: Unable to access opcode bytes at RIP 0x7fc7dcdd1c7f. RSP: 002b:00007ffd29527798 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fc7dce1c42b RCX: 00007fc7dcdd1ca9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000010 R08: 00007ffd29525536 R09: 00007ffd29528a50 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd29528a50 R13: 00007fc7dce1c3b9 R14: 0000555555a7f430 R15: 000000000000000e ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000170 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 10e997067 P4D 10e997067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12940 Comm: syz-executor.4 Tainted: G B W 5.10.210-syzkaller-00394-g70b6ab09a34b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline] RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline] RIP: 0010:ihold+0x25/0x60 fs/inode.c:423 Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 11 45 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 10 c7 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 94 48 b3 RSP: 0018:ffffc90000de7b48 EFLAGS: 00010246 RAX: ffff88813e2d0000 RBX: 0000000000000001 RCX: ffff88813e2d0000 RDX: 0000000000000000 RSI: 0000000000000286 RDI: 00000000ffffffff RBP: ffffc90000de7b58 R08: ffffffff813e2dfb R09: 0000000000000003 R10: fffffbfff0e10448 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff88811cb94880 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 000000013b3fe000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_delete_notify include/linux/fsnotify.h:258 [inline] vfs_rmdir+0x200/0x3f0 fs/namei.c:3865 incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1945 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x129/0x190 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc83/0x2a50 kernel/exit.c:861 do_group_exit+0x141/0x310 kernel/exit.c:983 __do_sys_exit_group kernel/exit.c:994 [inline] __se_sys_exit_group kernel/exit.c:992 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:992 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fc7dcdd1ca9 Code: Unable to access opcode bytes at RIP 0x7fc7dcdd1c7f. RSP: 002b:00007ffd29527798 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fc7dce1c42b RCX: 00007fc7dcdd1ca9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000010 R08: 00007ffd29525536 R09: 00007ffd29528a50 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffd29528a50 R13: 00007fc7dce1c3b9 R14: 0000555555a7f430 R15: 000000000000000e Modules linked in: CR2: 0000000000000170 ---[ end trace 303c06e88ea05664 ]--- RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline] RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline] RIP: 0010:ihold+0x25/0x60 fs/inode.c:423 Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 11 45 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 10 c7 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 94 48 b3 RSP: 0018:ffffc90000de7b48 EFLAGS: 00010246 RAX: ffff88813e2d0000 RBX: 0000000000000001 RCX: ffff88813e2d0000 RDX: 0000000000000000 RSI: 0000000000000286 RDI: 00000000ffffffff RBP: ffffc90000de7b58 R08: ffffffff813e2dfb R09: 0000000000000003 R10: fffffbfff0e10448 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff88811cb94880 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000170 CR3: 000000013b3fe000 CR4: 00000000003506b0 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: 00 55 48 add %dl,0x48(%rbp) 7: 89 e5 mov %esp,%ebp 9: 41 56 push %r14 b: 53 push %rbx c: 49 89 fe mov %rdi,%r14 f: e8 11 45 b3 ff call 0xffb34525 14: 49 8d be 70 01 00 00 lea 0x170(%r14),%rdi 1b: be 04 00 00 00 mov $0x4,%esi 20: e8 10 c7 f0 ff call 0xfff0c735 25: bb 01 00 00 00 mov $0x1,%ebx * 2a: f0 41 0f c1 9e 70 01 lock xadd %ebx,0x170(%r14) <-- trapping instruction 31: 00 00 33: ff c3 inc %ebx 35: bf 02 00 00 00 mov $0x2,%edi 3a: 89 de mov %ebx,%esi 3c: e8 .byte 0xe8 3d: 94 xchg %eax,%esp 3e: 48 rex.W 3f: b3 .byte 0xb3