INFO: task syz-executor.1:10060 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26128 pid:10060 ppid: 8398 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 io_uring_cancel_files fs/io_uring.c:8699 [inline] io_uring_cancel_task_requests+0x15e4/0x1900 fs/io_uring.c:8730 __io_uring_files_cancel+0xe7/0x170 fs/io_uring.c:8816 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x258/0x2340 kernel/exit.c:780 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x1734/0x1ef0 kernel/signal.c:2773 arch_do_signal_or_restart+0x3c/0x610 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0xac/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x48/0x180 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f1f03d03188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000200 RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000000000000 RSI: 0000000000000302 RDI: 0000000000000003 RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdf88e76ef R14: 00007f1f03d03300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:6/299: #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfd0 kernel/workqueue.c:2248 #1: ffffc90001e2fd78 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfd0 kernel/workqueue.c:2250 1 lock held by khungtaskd/1655: #0: ffffffff8c70fe00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 2 locks held by in:imklog/8095: #0: ffff88802209b770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 #1: ffffffff8c7de128 (remove_cache_srcu){....}-{0:0}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1655 Comm: khungtaskd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x176/0x24e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4823 Comm: systemd-journal Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:174 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x33/0x60 kernel/kcov.c:197 Code: 80 ef 01 00 65 8b 15 d4 41 89 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 d4 14 00 00 00 74 2c 8b 91 b0 14 00 00 <83> fa 02 75 21 48 8b 91 b8 14 00 00 48 8b 32 48 8d 7e 01 8b 89 b4 RSP: 0018:ffffc9000a937f18 EFLAGS: 00000046 RAX: ffffffff817eab26 RBX: 0000000000000001 RCX: ffff888022ddb780 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff812be043 R09: ffffed10045bb6f1 R10: ffffed10045bb6f1 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888022ddb780 R15: ffffc9000a937f58 FS: 00007f45d66fe8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f45d3b1d000 CR3: 0000000026583000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on_prepare+0x6/0x70 kernel/trace/trace_preemptirq.c:29 __exit_to_user_mode kernel/entry/common.c:125 [inline] syscall_exit_to_user_mode+0x4d/0x180 kernel/entry/common.c:303 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f45d5996f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007fffae103f18 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: 00000000000012d7 RBX: 000055c8f181f1e0 RCX: 00007f45d5996f17 RDX: 00000000ffffffff RSI: 00007fffae103fa0 RDI: 000055c8f181f1e0 RBP: 00000000000012d7 R08: 00007fffae19c080 R09: 0000000000000000 R10: 00007fffae19c0a8 R11: 0000000000000202 R12: 00007fffae103fa0 R13: 00007fffae103f98 R14: 000055c8f0b82958 R15: 0005bd0236d21aab