Oops: general protection fault, probably for non-canonical address 0xdffffc0000000048: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000240-0x0000000000000247] CPU: 1 UID: 0 PID: 5944 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:timer_is_static_object+0x26/0x80 kernel/time/timer.c:691 Code: 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 95 e8 12 00 4c 8d 73 08 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 8b e0 78 00 49 83 3e 00 74 09 e8 RSP: 0018:ffffc900044279a8 EFLAGS: 00010006 RAX: 0000000000000048 RBX: 0000000000000238 RCX: ffff88817417d7c0 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000238 RBP: ffffffff99a2bcc0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff81ae62d0 R12: ffffffff8b6d2550 R13: fffffffffffffffe R14: 0000000000000240 R15: dffffc0000000000 FS: 000055555c51f500(0000) GS:ffff8882a9e8e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2077ec08 CR3: 00000001138de000 CR4: 00000000000006f0 Call Trace: lookup_object_or_alloc lib/debugobjects.c:679 [inline] debug_object_assert_init+0x16f/0x380 lib/debugobjects.c:1008 debug_timer_assert_init kernel/time/timer.c:803 [inline] debug_assert_init kernel/time/timer.c:848 [inline] __timer_delete+0x31/0x390 kernel/time/timer.c:1366 try_to_grab_pending kernel/workqueue.c:2061 [inline] work_grab_pending+0x121/0x990 kernel/workqueue.c:2154 __cancel_work+0x85/0x2c0 kernel/workqueue.c:4368 __cancel_work_sync+0x1f/0x110 kernel/workqueue.c:4385 hfsplus_put_super+0x56/0x3e0 fs/hfsplus/super.c:328 generic_shutdown_super+0x135/0x2c0 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1730 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3b71f90af7 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:00007ffd2077f3b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f3b71fee72f RCX: 00007f3b71f90af7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd2077f470 RBP: 00007ffd2077f470 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd20780500 R13: 00007f3b71fee72f R14: 000000000000f9eb R15: 00007ffd20780540 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:timer_is_static_object+0x26/0x80 kernel/time/timer.c:691 Code: 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 95 e8 12 00 4c 8d 73 08 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 8b e0 78 00 49 83 3e 00 74 09 e8 RSP: 0018:ffffc900044279a8 EFLAGS: 00010006 RAX: 0000000000000048 RBX: 0000000000000238 RCX: ffff88817417d7c0 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000238 RBP: ffffffff99a2bcc0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff81ae62d0 R12: ffffffff8b6d2550 R13: fffffffffffffffe R14: 0000000000000240 R15: dffffc0000000000 FS: 000055555c51f500(0000) GS:ffff8882a9e8e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2077ec08 CR3: 00000001138de000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: f3 0f 1e fa endbr64 8: 41 57 push %r15 a: 41 56 push %r14 c: 53 push %rbx d: 48 89 fb mov %rdi,%rbx 10: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 17: fc ff df 1a: e8 95 e8 12 00 call 0x12e8b4 1f: 4c 8d 73 08 lea 0x8(%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 8b e0 78 00 call 0x78e0c4 39: 49 83 3e 00 cmpq $0x0,(%r14) 3d: 74 09 je 0x48 3f: e8 .byte 0xe8