INFO: task syz-executor.2:10632 blocked for more than 143 seconds. Not tainted 5.10.0-rc7-next-20201210-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:28952 pid:10632 ppid: 8524 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1854 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x163/0x260 kernel/sched/completion.c:138 kthread_park+0x122/0x1b0 kernel/kthread.c:557 io_sq_thread_park fs/io_uring.c:7348 [inline] io_sq_thread_park fs/io_uring.c:7342 [inline] io_uring_cancel_task_requests fs/io_uring.c:8821 [inline] __io_uring_files_cancel+0x2c2/0x1550 fs/io_uring.c:8925 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: 0033:0x45e159 RSP: 002b:00007f0e31efbcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 000000000119c030 RCX: 000000000045e159 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c030 RBP: 000000000119c028 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffdea96c44f R14: 00007f0e31efc9c0 R15: 000000000119c034 Showing all locks held in the system: 3 locks held by kworker/u4:7/260: 1 lock held by khungtaskd/1657: #0: ffffffff8b78f120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8185: #0: ffff8880119bad70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:923 1 lock held by syz-executor.2/10632: #0: ffff888026dbec70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7347 [inline] #0: ffff888026dbec70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7342 [inline] #0: ffff888026dbec70 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests fs/io_uring.c:8821 [inline] #0: ffff888026dbec70 (&sqd->lock){+.+.}-{3:3}, at: __io_uring_files_cancel+0x2a4/0x1550 fs/io_uring.c:8925 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1657 Comm: khungtaskd Not tainted 5.10.0-rc7-next-20201210-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: 9899 Comm: kworker/u4:5 Not tainted 5.10.0-rc7-next-20201210-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy14 ieee80211_iface_work RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:166 [inline] RIP: 0010:unwind_next_frame+0x30b/0x2460 arch/x86/kernel/unwind_orc.c:443 Code: 30 44 8b 5c 24 28 8b 54 24 20 48 8b 4c 24 18 46 8b 04 85 48 f4 8e 8e 44 89 df 48 8d 34 7f 48 8d b4 36 60 21 f0 8d 41 83 c0 01 <48> 81 fe 48 f4 8e 8e 0f 83 3e 11 00 00 45 89 c1 4f 8d 0c 49 4f 8d RSP: 0018:ffffc90015d26cf8 EFLAGS: 00000206 RAX: 0000000000003113 RBX: 1ffff92002ba4da9 RCX: ffffffff813113e2 RDX: 0000000000084082 RSI: ffffffff8df4d412 RDI: 000000000000c873 RBP: 0000000000000001 R08: 000000000000c874 R09: 0000000000000000 R10: fffff52002ba4dd1 R11: 000000000000c873 R12: ffffc90015d26e78 R13: ffffc90015d26e65 R14: ffffc90015d26e80 R15: ffffc90015d26e30 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6e08c5000 CR3: 000000001405a000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unwind_start+0x547/0x810 arch/x86/kernel/unwind_orc.c:696 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:39 kasan_set_track mm/kasan/common.c:47 [inline] set_alloc_info mm/kasan/common.c:405 [inline] ____kasan_kmalloc mm/kasan/common.c:436 [inline] ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:408 kmalloc include/linux/slab.h:570 [inline] ieee802_11_parse_elems_crc+0x121/0x1030 net/mac80211/util.c:1473 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2042 [inline] ieee80211_bss_info_update+0x522/0xc00 net/mac80211/scan.c:212 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline] ieee80211_rx_mgmt_probe_beacon+0xcf0/0x17d0 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