INFO: task syz-executor.0:10010 blocked for more than 143 seconds. Not tainted 5.10.0-next-20201223-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27672 pid:10010 ppid: 8484 flags:0x00024002 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 io_uring_cancel_files fs/io_uring.c:8777 [inline] io_uring_cancel_task_requests fs/io_uring.c:8835 [inline] __io_uring_files_cancel+0xc9d/0x14f0 fs/io_uring.c:8932 io_uring_files_cancel include/linux/io_uring.h:51 [inline] exit_files+0xe4/0x170 fs/file.c:431 do_exit+0xb4f/0x2a00 kernel/exit.c:818 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3e9/0x2160 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 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+0x124/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e229 RSP: 002b:00007fad1eaa7c68 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000100 RBX: 0000000000000006 RCX: 000000000045e229 RDX: 0000000000000000 RSI: 000000000000450c RDI: 0000000000000003 RBP: 000000000119bfd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc9d32071f R14: 00007fad1eaa89c0 R15: 000000000119bf8c Showing all locks held in the system: 1 lock held by khungtaskd/1658: #0: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 2 locks held by in:imklog/8182: #0: ffff8880149985f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:949 #1: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: rq_lock kernel/sched/sched.h:1318 [inline] #1: ffffffff8b793ae0 (rcu_read_lock){....}-{1:2}, at: __schedule+0x235/0x21b0 kernel/sched/core.c:4995 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.10.0-next-20201223-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+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xe75/0x1020 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 5.10.0-next-20201223-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy7 ieee80211_iface_work RIP: 0010:debug_lockdep_rcu_enabled+0x23/0x30 kernel/rcu/update.c:278 Code: cc cc cc cc cc cc cc 8b 05 3e 26 69 04 85 c0 74 21 8b 05 0c 57 69 04 85 c0 74 17 65 48 8b 04 25 00 f0 01 00 8b 80 8c 09 00 00 <85> c0 0f 94 c0 0f b6 c0 c3 cc cc cc cc 55 53 48 c7 c3 80 5a 03 00 RSP: 0018:ffffc90000ce6fe0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888011568000 RSI: ffffffff883ffbcf RDI: 0000000000000003 RBP: ffff888030d28468 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff883ffb7f R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880722c8580 R14: ffff88802419bc80 R15: 0000000000000080 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7973414000 CR3: 0000000012e30000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0xd/0x70 kernel/rcu/update.c:121 trace_cfg80211_return_bss net/wireless/trace.h:3309 [inline] trace_cfg80211_return_bss+0x234/0x2a0 net/wireless/trace.h:3309 cfg80211_inform_single_bss_frame_data+0x796/0xeb0 net/wireless/scan.c:2415 cfg80211_inform_bss_frame_data+0xa7/0xb10 net/wireless/scan.c:2433 ieee80211_bss_info_update+0x43c/0xbc0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline] ieee80211_rx_mgmt_probe_beacon+0xcf0/0x1760 net/mac80211/ibss.c:1615 ieee80211_ibss_rx_queued_mgmt+0xe2f/0x16d0 net/mac80211/ibss.c:1642 ieee80211_iface_work+0x7b0/0xa50 net/mac80211/iface.c:1423 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296