INFO: task syz-executor.4:12983 blocked for more than 143 seconds.
Not tainted 5.16.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:27992 pid:12983 ppid: 3639 flags:0x00024004
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xa9a/0x4900 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385
__mutex_lock_common kernel/locking/mutex.c:680 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
io_uring_del_tctx_node+0x109/0x20a fs/io_uring.c:9781
io_uring_clean_tctx fs/io_uring.c:9797 [inline]
io_uring_cancel_generic+0x5da/0x695 fs/io_uring.c:9888
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:2852
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: 0033:0x7f9846319e99
RSP: 002b:00007f9844c0b168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000001000 RBX: 00007f984642d2a0 RCX: 00007f9846319e99
RDX: 0000000000000000 RSI: 000000000000688c RDI: 0000000000000003
RBP: 00007f9846373ff1 R08: 0000000000000000 R09: 000000000000fc00
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffbcedf7bf R14: 00007f9844c0b300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb812a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
2 locks held by getty/3286:
#0: ffff88807f274098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
#1: ffffc90002b8e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113
2 locks held by syz-executor.4/12972:
1 lock held by syz-executor.4/12983:
#0: ffff8880292c70a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_del_tctx_node+0x109/0x20a fs/io_uring.c:9781
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc7-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xc1d/0xf50 kernel/hung_task.c:295
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12972 Comm: syz-executor.4 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:984 [inline]
RIP: 0010:debug_check_no_obj_freed+0x136/0x420 lib/debugobjects.c:1023
Code: 49 8d 78 18 41 83 c4 01 49 8b 28 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 30 02 00 00 4d 8b 48 18 4c 39 cb 0f 87 8e 00 00 00 <4c> 3b 0c 24 0f 83 84 00 00 00 49 8d 78 10 48 89 f8 48 c1 e8 03 42
RSP: 0018:ffffc9000549fce8 EFLAGS: 00000097
RAX: 1ffff1100e6248ea RBX: ffff888029dab300 RCX: ffffffff815c4e40
RDX: 1ffffffff20cc646 RSI: 0000000000000004 RDI: ffff888073124750
RBP: ffff88802b5b9268 R08: ffff888073124738 R09: ffff888029dabd88
R10: fffff52000a93f8b R11: 0000000000000001 R12: 0000000000000004
R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
FS: 00007f9844c8f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c012372570 CR3: 000000008e32b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kfree+0xd4/0x2c0 mm/slab.c:3801
io_clean_op+0x468/0xba0 fs/io_uring.c:6651
io_dismantle_req fs/io_uring.c:2064 [inline]
io_req_complete_post+0x5dc/0x820 fs/io_uring.c:1911
tctx_task_work+0x1b3/0x630 fs/io_uring.c:2245
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_signal include/linux/tracehook.h:214 [inline]
handle_signal_work kernel/entry/common.c:146 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x256/0x290 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: 0033:0x7f9846319e99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9844c8f168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000001000 RBX: 00007f984642cf60 RCX: 00007f9846319e99
RDX: 0000000000000000 RSI: 000000000000688c RDI: 0000000000000003
RBP: 00007f9846373ff1 R08: 0000000000000000 R09: 000000000000fc00
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffbcedf7bf R14: 00007f9844c8f300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 49 8d 78 18 lea 0x18(%r8),%rdi
4: 41 83 c4 01 add $0x1,%r12d
8: 49 8b 28 mov (%r8),%rbp
b: 48 89 f8 mov %rdi,%rax
e: 48 c1 e8 03 shr $0x3,%rax
12: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
17: 0f 85 30 02 00 00 jne 0x24d
1d: 4d 8b 48 18 mov 0x18(%r8),%r9
21: 4c 39 cb cmp %r9,%rbx
24: 0f 87 8e 00 00 00 ja 0xb8
* 2a: 4c 3b 0c 24 cmp (%rsp),%r9 <-- trapping instruction
2e: 0f 83 84 00 00 00 jae 0xb8
34: 49 8d 78 10 lea 0x10(%r8),%rdi
38: 48 89 f8 mov %rdi,%rax
3b: 48 c1 e8 03 shr $0x3,%rax
3f: 42 rex.X