syzbot


INFO: task hung in blkdev_issue_flush

Status: closed as dup on 2019/02/16 05:19
Reported-by: syzbot+e711500e2ec1ca3755a1@syzkaller.appspotmail.com
First crash: 1749d, last: 1445d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
INFO: task hung in lo_ioctl 47 1759d 1875d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-44 INFO: task hung in blkdev_issue_flush 7 1666d 1777d 0/2 auto-closed as invalid on 2019/02/22 12:34
linux-4.19 INFO: task hung in blkdev_issue_flush C done 2 1306d 1306d 1/1 fixed on 2019/12/02 18:09
android-414 INFO: task hung in blkdev_issue_flush 1 1258d 1258d 0/1 auto-closed as invalid on 2019/12/17 04:03
android-49 INFO: task hung in blkdev_issue_flush 63 1659d 1796d 0/3 auto-closed as invalid on 2019/02/22 14:39
upstream INFO: task hung in blkdev_issue_flush (2) C done error 3 1147d 1306d 17/24 fixed on 2020/06/30 18:57

Sample crash report:
XFS (loop3): invalid logbufs value: 47 [not 2-8]
XFS (loop3): invalid logbufs value: 47 [not 2-8]
block nbd0: Device being setup by another task
block nbd0: Device being setup by another task
block nbd0: shutting down sockets
INFO: task syz-executor5:22980 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc8+ #72
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D22776 22980   5506 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
 schedule+0xfe/0x460 kernel/sched/core.c:3517
 schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780
 io_schedule_timeout+0x26/0x80 kernel/sched/core.c:5128
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common_io kernel/sched/completion.c:121 [inline]
 wait_for_completion_io+0x427/0x8a0 kernel/sched/completion.c:169
 submit_bio_wait+0x13c/0x1e0 block/bio.c:930
 blkdev_issue_flush+0x204/0x300 block/blk-flush.c:553
 blkdev_fsync+0x93/0xd0 fs/block_dev.c:633
 vfs_fsync_range+0x140/0x220 fs/sync.c:197
 vfs_fsync fs/sync.c:211 [inline]
 do_fsync+0x52/0xa0 fs/sync.c:221
 __do_sys_fdatasync fs/sync.c:234 [inline]
 __se_sys_fdatasync fs/sync.c:232 [inline]
 __x64_sys_fdatasync+0x36/0x50 fs/sync.c:232
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: 83 c4 18 c3 e8 d8 64 00 00 48 8b 04 24 48 8b 4c 24 08 48 89 01 e8 d7 2d fc ff e8 22 7a fc ff b8 02 00 00 00 48 8d 0d 2a 60 09 <01> 87 01 8b 05 22 60 09 01 83 f8 01 0f 85 8a 00 00 00 b8 01 00 00
RSP: 002b:00007f954960bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f954960c6d4
R13: 00000000004bdd72 R14: 00000000004ccad8 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/982:
 #0: 00000000786500d6 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435
1 lock held by rsyslogd/5245:
 #0: 0000000014074909 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/5335:
 #0: 000000003687f5b3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000006ea95d90 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5336:
 #0: 00000000751692d4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000084f358d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5337:
 #0: 000000002c3f5b7e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000067ea8cfd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5338:
 #0: 00000000eeb7d730 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000d58fc74c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5339:
 #0: 00000000555f3f5d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000006f5d0426 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5340:
 #0: 00000000ca121e75 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000e61868cc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5341:
 #0: 000000001435f232 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000020db34df (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by kworker/u5:1/8140:
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline]
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 00000000ae0d61cf ((wq_completion)"knbd-recv"){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124
 #1: 0000000011c8d42e ((work_completion)(&args->work)){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128
2 locks held by syz-executor4/17545:
 #0: 00000000fd388ac1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000015d21f3b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/17694:
 #0: 0000000061d1070f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000afc7b0d9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/18071:
 #0: 00000000a1dcbd7b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000002e5fb414 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/18132:
 #0: 00000000a2dc80a6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000006d377b24 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/18194:
 #0: 0000000092ab9e1d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000011547a5d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/18410:
 #0: 00000000b544cb8b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000010d0189 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/18703:
 #0: 000000009467ac2a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000607d4bbf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/19364:
 #0: 00000000016acd99 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000007a3a0a28 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/19443:
 #0: 000000007b04f026 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000004d63cf47 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/19522:
 #0: 00000000048511e6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000929c4593 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/19648:
 #0: 00000000873c899c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000041ea2c6e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/19944:
 #0: 000000001fb421bf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000002fe7b1d3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/20185:
 #0: 00000000b9aa66fa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000002a1a853f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/20364:
 #0: 000000000b3fd185 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000008e6922f3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/20567:
 #0: 0000000074ac77c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000cd794f7a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/20698:
 #0: 000000008052fe9f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000ac574143 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/20744:
 #0: 00000000544afddd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000f02bc24c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor4/20880:
 #0: 00000000dddbbd98 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000f4f1c901 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140

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

NMI backtrace for cpu 0
CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc8+ #72
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+0x1c4/0x2b6 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0xb3e/0x1050 kernel/hung_task.c:265
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57

Crashes (12):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-smack-root 2018/10/21 20:40 upstream 23469de647c4 ecb386fe .config console log report
ci-upstream-kasan-gce-smack-root 2018/09/26 03:42 upstream 846e8dd47c26 b7e11289 .config console log report
ci-upstream-kasan-gce-root 2018/05/30 20:51 upstream d60d61f36b8f 2f93b54f .config console log report
ci-upstream-kasan-gce-root 2018/05/24 13:52 upstream bee797529d7c f48c20b8 .config console log report
ci-upstream-kasan-gce-root 2018/05/24 11:58 upstream bee797529d7c f48c20b8 .config console log report
ci-upstream-kasan-gce-root 2018/05/17 03:44 upstream e6506eb24187 a367c1d7 .config console log report
ci-upstream-kasan-gce-root 2018/05/08 18:04 upstream 036db8bd9637 b88872ba .config console log report
ci-upstream-kasan-gce-root 2018/04/29 16:30 upstream cdface520934 d5a5d045 .config console log report
ci-upstream-kasan-gce-root 2018/04/20 20:56 upstream 43f70c960180 cc402841 .config console log report
ci-upstream-kasan-gce-root 2018/04/19 08:59 upstream 87ef12027b9b d1b2ef69 .config console log report
ci-upstream-kasan-gce-root 2018/04/15 16:01 upstream 18b7fd1c93e5 7a67784c .config console log report
ci-upstream-linux-next-kasan-gce-root 2019/02/13 23:17 linux-next c4f3ef3eb53f 0a49c954 .config console log report
* Struck through repros no longer work on HEAD.