INFO: task syz-executor.2:9474 blocked for more than 143 seconds.
Not tainted 5.15.0-next-20211106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:27928 pid: 9474 ppid: 6546 flags:0x00024004
Call Trace:
context_switch kernel/sched/core.c:4984 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6265
schedule+0xd2/0x260 kernel/sched/core.c:6338
io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9850
io_uring_files_cancel include/linux/io_uring.h:16 [inline]
do_exit+0x60c/0x2b40 kernel/exit.c:787
do_group_exit+0x125/0x310 kernel/exit.c:929
get_signal+0x47d/0x2220 kernel/signal.c:2830
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fcf10f6bae9
RSP: 002b:00007fcf0e4e1218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fcf1107ef68 RCX: 00007fcf10f6bae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcf1107ef68
RBP: 00007fcf1107ef60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcf1107ef6c
R13: 00007fff94e72a0f R14: 00007fcf0e4e1300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6236:
#0: ffff888072ea7270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-next-20211106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2958 Comm: systemd-journal Not tainted 5.15.0-next-20211106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:set_root+0x297/0x5b0 fs/namei.c:942
Code: 00 00 00 00 fc ff df 4c 8b 6b 28 49 8d 7d 08 48 89 f8 48 c1 e8 03 0f b6 04 08 84 c0 74 08 3c 03 0f 8e 9b 02 00 00 45 8b 6d 08 <31> ff 45 89 ef 41 83 e7 01 44 89 fe e8 d8 08 ab ff 45 85 ff 74 71
RSP: 0018:ffffc90001b1fac8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90001b1fce0 RCX: dffffc0000000000
RDX: ffff88801ab23be8 RSI: ffffffff81ccc3fd RDI: ffff88801ab23bf0
RBP: ffffc90001b1fb40 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81ccc3be R11: 000000000000002f R12: 0000000000000002
R13: 0000000000000002 R14: ffff88801b10b500 R15: ffff88801b10b550
FS: 00007efcb128a8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efcae6d8000 CR3: 000000001be77000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
nd_jump_root+0x3c8/0x570 fs/namei.c:961
path_init+0x1020/0x1920 fs/namei.c:2359
path_lookupat+0x30/0x860 fs/namei.c:2439
filename_lookup+0x1c6/0x590 fs/namei.c:2478
user_path_at_empty+0x42/0x60 fs/namei.c:2801
user_path_at include/linux/namei.h:57 [inline]
do_faccessat+0x127/0x850 fs/open.c:421
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7efcb05459c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc5d8a2a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffc5d8a5ab0 RCX: 00007efcb05459c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055b1645fd9a3
RBP: 00007ffc5d8a2bd0 R08: 000055b1645f33e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 000055b1649068a0 R15: 00007ffc5d8a30c0
----------------
Code disassembly (best guess), 6 bytes skipped:
0: df 4c 8b 6b fisttps 0x6b(%rbx,%rcx,4)
4: 28 49 8d sub %cl,-0x73(%rcx)
7: 7d 08 jge 0x11
9: 48 89 f8 mov %rdi,%rax
c: 48 c1 e8 03 shr $0x3,%rax
10: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax
14: 84 c0 test %al,%al
16: 74 08 je 0x20
18: 3c 03 cmp $0x3,%al
1a: 0f 8e 9b 02 00 00 jle 0x2bb
20: 45 8b 6d 08 mov 0x8(%r13),%r13d
* 24: 31 ff xor %edi,%edi <-- trapping instruction
26: 45 89 ef mov %r13d,%r15d
29: 41 83 e7 01 and $0x1,%r15d
2d: 44 89 fe mov %r15d,%esi
30: e8 d8 08 ab ff callq 0xffab090d
35: 45 85 ff test %r15d,%r15d
38: 74 71 je 0xab