INFO: task syz-executor.5:27824 blocked for more than 143 seconds. Not tainted 5.8.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27896 27824 7279 0x20024000 Call Trace: context_switch kernel/sched/core.c:3458 [inline] __schedule+0x8ea/0x2210 kernel/sched/core.c:4219 schedule+0xd0/0x2a0 kernel/sched/core.c:4294 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 __pipe_lock fs/pipe.c:87 [inline] pipe_release+0x49/0x320 fs/pipe.c:722 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:239 [inline] __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:269 __do_fast_syscall_32 arch/x86/entry/common.c:475 [inline] do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:503 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f9d569 Code: Bad RIP value. RSP: 002b:00000000f5d980cc EFLAGS: 00000296 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffea RBX: 0000000020000340 RCX: 0000000000000058 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:2/57: #0: ffff8880ae735e18 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x77f/0xe30 kernel/sched/fair.c:10536 #1: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1051 [inline] #1: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x3e0 kernel/sched/fair.c:6006 #2: ffff8880ae7255d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x55/0x1a0 kernel/time/timer.c:946 1 lock held by khungtaskd/1145: #0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6498: #0: ffff8880a8a4bdb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 1 lock held by syz-executor.3/8701: #0: ffff8880a1fc2c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:66 [inline] #0: ffff8880a1fc2c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock+0x5a/0x70 fs/pipe.c:74 1 lock held by syz-executor.5/27824: #0: ffff888094a7d468 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:87 [inline] #0: ffff888094a7d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x49/0x320 fs/pipe.c:722 1 lock held by syz-executor.5/27874: #0: ffff888094a7d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:66 [inline] #0: ffff888094a7d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock+0x5a/0x70 fs/pipe.c:74 1 lock held by syz-executor.2/2452: #0: ffff8880933b0868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:87 [inline] #0: ffff8880933b0868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x49/0x320 fs/pipe.c:722 1 lock held by syz-executor.2/2457: #0: ffff8880933b0868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:66 [inline] #0: ffff8880933b0868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock+0x5a/0x70 fs/pipe.c:74 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1145 Comm: khungtaskd Not tainted 5.8.0-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:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3431 Comm: kworker/1:6 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:__lock_acquire+0x1b5/0x56e0 kernel/locking/lockdep.c:4289 Code: 8d b4 24 d0 08 00 00 48 81 ea 40 ae 59 8c 48 b9 a7 37 bd e9 4d 6f 7a d3 48 c1 fa 03 48 89 74 24 28 48 0f af d1 48 89 54 24 08 <8b> 54 24 10 4c 8d 14 92 49 c1 e2 03 85 d2 74 47 4a 8d 54 16 d8 48 RSP: 0018:ffffc9000d2f7918 EFLAGS: 00000803 RAX: 0000000000000003 RBX: 0000000000000000 RCX: d37a6f4de9bd37a7 RDX: 000000000000002c RSI: ffff88809a4a6e90 RDI: ffffffff89bc11c8 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88809a4a65c0 R13: 0000000000000000 R14: ffffffff89bc11c0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd28d1b000 CR3: 0000000098928000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] net_dm_hw_report+0x39/0x1e0 net/core/drop_monitor.c:989 devlink_trap_report+0x39e/0x550 net/core/devlink.c:8921 nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x879/0xbe0 drivers/net/netdevsim/dev.c:598 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293