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INFO: task hung in blk_mq_freeze_queue

Status: auto-closed as invalid on 2019/10/25 10:51
Subsystems: block
[Documentation on labels]
First crash: 1963d, last: 1811d
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in blk_mq_freeze_queue (2) block 79 879d 879d 0/26 closed as dup on 2021/11/21 13:58
android-44 INFO: task hung in blk_mq_freeze_queue C 330 2102d 1833d 0/2 public: reported C repro on 2019/04/11 08:44
android-49 INFO: task hung in blk_mq_freeze_queue C 379 2103d 1833d 0/3 public: reported C repro on 2019/04/12 00:00

Sample crash report:
INFO: task syz-executor.4:7877 blocked for more than 143 seconds.
      Not tainted 5.1.0-rc7+ #99
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D24608  7877   7876 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x813/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 blk_mq_freeze_queue_wait+0x138/0x2a0 block/blk-mq.c:159
 blk_freeze_queue block/blk-mq.c:186 [inline]
 blk_mq_freeze_queue+0x1e/0x30 block/blk-mq.c:195
 __loop_clr_fd+0x13c/0xd60 drivers/block/loop.c:1059
 loop_clr_fd drivers/block/loop.c:1177 [inline]
 lo_ioctl+0x210/0x2150 drivers/block/loop.c:1546
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x6f2/0x1d10 block/ioctl.c:605
 block_ioctl+0xee/0x130 fs/block_dev.c:1934
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c17
Code: Bad RIP value.
RSP: 002b:00007ffc9125aa48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c17
RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003
RBP: 0000000000002cd2 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc9125aa80 R14: 00000000002357d2 R15: 00007ffc9125aa90
INFO: task syz-executor.1:16330 blocked for more than 144 seconds.
      Not tainted 5.1.0-rc7+ #99
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28384 16330   7868 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x813/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 schedule_timeout+0x8ca/0xfd0 kernel/time/timer.c:1779
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common kernel/sched/completion.c:115 [inline]
 wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136
 __wait_rcu_gp+0x22a/0x2f0 kernel/rcu/update.c:349
 synchronize_rcu.part.0+0xcf/0xe0 kernel/rcu/tree.c:3045
 synchronize_rcu+0x27/0xa0 kernel/rcu/tree.c:3046
 tracepoint_synchronize_unregister include/linux/tracepoint.h:85 [inline]
 perf_trace_event_unreg.isra.0+0xd0/0x220 kernel/trace/trace_event_perf.c:163
 perf_uprobe_destroy+0xc3/0x130 kernel/trace/trace_event_perf.c:340
 _free_event+0x356/0x13b0 kernel/events/core.c:4454
 put_event+0x47/0x60 kernel/events/core.c:4540
 perf_event_release_kernel+0x693/0xbe0 kernel/events/core.c:4646
 perf_release+0x37/0x50 kernel/events/core.c:4656
 __fput+0x2e5/0x8d0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x14a/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x412b61
Code: f1 41 00 be 06 00 00 00 4c 89 f7 31 c0 e8 e7 0a 00 00 48 8b 7c 24 18 e8 bd 26 00 00 80 bb 9c 00 00 00 00 48 89 df 74 15 e8 bc <35> ff ff 31 db 48 c7 44 24 18 00 00 00 00 e9 eb 00 00 00 e8 a7 35
RSP: 002b:00007ffe02a58ec0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000412b61
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: 000000007573aa14 R09: 000000007573aa18
R10: 00007ffe02a58fa0 R11: 0000000000000293 R12: 000000000073c900
R13: 000000000073c900 R14: 0000000000235a41 R15: 000000000073bf0c

Showing all locks held in the system:
1 lock held by khungtaskd/1042:
 #0: 0000000062979bdb (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5057
1 lock held by rsyslogd/7740:
 #0: 00000000dbde0f43 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/7830:
 #0: 0000000069d66557 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000092d2cf5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7831:
 #0: 000000007051f506 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000c1a31c4f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7832:
 #0: 00000000a2aea4c8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000d9b95003 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7833:
 #0: 00000000c65363a2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000159b9e65 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7834:
 #0: 000000003ca72f7f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000902acff5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7835:
 #0: 000000004eed2dbe (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000a44c4cf8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7836:
 #0: 00000000abef3260 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000093f46ceb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.2/7870:
 #0: 00000000be5e2c0a (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1660 fs/block_dev.c:1514
 #1: 0000000076ceed8f (loop_ctl_mutex){+.+.}, at: lo_open+0x1d/0xd0 drivers/block/loop.c:1736
1 lock held by syz-executor.4/7877:
 #0: 0000000076ceed8f (loop_ctl_mutex){+.+.}, at: __loop_clr_fd+0x88/0xd60 drivers/block/loop.c:1046
2 locks held by syz-executor.5/7881:
 #0: 00000000bd354ba4 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1660 fs/block_dev.c:1514
 #1: 0000000076ceed8f (loop_ctl_mutex){+.+.}, at: lo_open+0x1d/0xd0 drivers/block/loop.c:1736
2 locks held by kworker/1:1/21786:
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline]
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
 #0: 0000000099a9816f ((wq_completion)events){+.+.}, at: process_one_work+0x87e/0x1790 kernel/workqueue.c:2240
 #1: 00000000b2ee5f2c ((work_completion)(&ns->proc_work)){+.+.}, at: process_one_work+0x8b4/0x1790 kernel/workqueue.c:2244
1 lock held by syz-executor.3/23906:
1 lock held by syz-executor.1/16330:
 #0: 000000002d5970ba (event_mutex){+.+.}, at: perf_uprobe_destroy+0x28/0x130 kernel/trace/trace_event_perf.c:338

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc7+ #99
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0x9b7/0xec0 kernel/hung_task.c:288
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/05/04 05:00 upstream a4ccb5f9dc6c d28f4ce5 .config console log report ci-upstream-kasan-gce-smack-root
2018/12/31 18:22 upstream 195303136f19 2b42fdc8 .config console log report ci-upstream-kasan-gce-root
2018/12/02 23:48 linux-next 442b8cea2477 7dcaeaf3 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.