INFO: task syz-executor.2:12429 blocked for more than 143 seconds. Not tainted 5.10.0-rc4-next-20201123-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:29248 pid:12429 ppid: 8493 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4316 [inline] __schedule+0x896/0x2050 kernel/sched/core.c:5067 schedule+0xcf/0x270 kernel/sched/core.c:5146 io_uring_cancel_files fs/io_uring.c:8745 [inline] io_uring_cancel_task_requests fs/io_uring.c:8797 [inline] __io_uring_files_cancel+0xc4d/0x14b0 fs/io_uring.c:8893 io_uring_files_cancel include/linux/io_uring.h:51 [inline] exit_files+0xe4/0x170 fs/file.c:456 do_exit+0xb61/0x29f0 kernel/exit.c:818 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3ec/0x2010 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:144 [inline] exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:198 syscall_exit_to_user_mode+0x36/0x260 kernel/entry/common.c:275 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 RSP: 002b:00007f8164390cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000118bfd0 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118bfd0 RBP: 000000000118bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007ffcc46966cf R14: 00007f81643919c0 R15: 000000000118bfd4 Showing all locks held in the system: 1 lock held by khungtaskd/1658: #0: ffffffff8b339e60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by systemd-journal/4899: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.10.0-rc4-next-20201123-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+0x44/0xd7 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+0xd89/0xf30 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: 16 Comm: ksoftirqd/1 Not tainted 5.10.0-rc4-next-20201123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_rx_h_userspace_mgmt net/mac80211/rx.c:3434 [inline] RIP: 0010:ieee80211_rx_handlers+0x394a/0xae50 net/mac80211/rx.c:3799 Code: 8d 78 4b 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 42 0f b6 04 20 38 d0 7f 08 84 c0 0f 85 5b 56 00 00 48 8b 44 24 38 80 48 4b 10 71 11 1e f9 48 8b 44 24 18 48 c1 e8 03 42 80 3c 20 00 0f 85 b3 RSP: 0018:ffffc90000d67790 EFLAGS: 00000283 RAX: 0000000000000000 RBX: 0000000000300000 RCX: ffffffff8852779d RDX: 0000000000000080 RSI: ffff888010dc8000 RDI: 0000000000000003 RBP: 0000000000000080 R08: 0000000000000000 R09: ffff88806d9f81cf R10: 00000000000000d0 R11: 0000000000000001 R12: dffffc0000000000 R13: 000000000000004c R14: ffff88807f34f850 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35a7090000 CR3: 000000001102c000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_invoke_rx_handlers net/mac80211/rx.c:3833 [inline] ieee80211_prepare_and_rx_handle+0x2414/0x61c0 net/mac80211/rx.c:4513 __ieee80211_rx_handle_packet net/mac80211/rx.c:4574 [inline] ieee80211_rx_list+0x1121/0x2500 net/mac80211/rx.c:4754 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4777 ieee80211_rx include/net/mac80211.h:4507 [inline] ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x1d7/0x2d0 kernel/softirq.c:558 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 run_ksoftirqd kernel/softirq.c:653 [inline] run_ksoftirqd+0x2d/0x50 kernel/softirq.c:645 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296