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INFO: task hung in add_transaction_credits

Status: closed as dup on 2018/09/24 00:42
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+7f3136c11be796025c31@syzkaller.appspotmail.com
First crash: 2097d, last: 2022d
▶ ▼ Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
INFO: task hung in jbd2_journal_commit_transaction ext4 C 52 2021d 2040d
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in add_transaction_credits 1 385d 385d 0/3 auto-obsoleted due to no activity on 2023/08/04 14:01
android-414 INFO: task hung in add_transaction_credits C 11 2025d 1842d 0/1 public: reported C repro on 2019/04/10 16:14
android-44 INFO: task hung in add_transaction_credits 1 2178d 2178d 0/2 auto-closed as invalid on 2019/02/22 14:56
android-49 INFO: task hung in add_transaction_credits C 4 2029d 1839d 0/3 public: reported C repro on 2019/04/14 00:00

Sample crash report:
INFO: task kworker/u4:1:23 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc6+ #41
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:1    D 9256    23      2 0x80000000
Workqueue: writeback wb_workfn (flush-8:0)
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
 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159
 add_transaction_credits+0x538/0xe50 fs/jbd2/transaction.c:187
 start_this_handle+0x41f/0x1250 fs/jbd2/transaction.c:357
 jbd2__journal_start+0x3c9/0xa90 fs/jbd2/transaction.c:439
 __ext4_journal_start_sb+0x1a5/0x5f0 fs/ext4/ext4_jbd2.c:81
 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline]
 ext4_writepages+0x18ba/0x4110 fs/ext4/inode.c:2836
 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2340
 __writeback_single_inode+0x20a/0x1620 fs/fs-writeback.c:1323
 writeback_sb_inodes+0x71f/0x11d0 fs/fs-writeback.c:1587
 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1656
 wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1765
 wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
 wb_do_writeback fs/fs-writeback.c:1920 [inline]
 wb_workfn+0x1008/0x1790 fs/fs-writeback.c:1949
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
INFO: task jbd2/sda1-8:3077 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc6+ #41
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
jbd2/sda1-8     D18264  3077      2 0x80000000
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
 jbd2_journal_commit_transaction+0xd42/0x89f8 fs/jbd2/commit.c:435
 kjournald2+0x26d/0xb30 fs/jbd2/journal.c:229
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413

Showing all locks held in the system:
4 locks held by kworker/u4:1/23:
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline]
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 00000000663ee89f ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xb43/0x1b90 kernel/workqueue.c:2124
 #1: 0000000046f839b7 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb9a/0x1b90 kernel/workqueue.c:2128
 #2: 00000000bd749d4a (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 fs/super.c:412
 #3: 0000000059cfd050 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 mm/page-writeback.c:2340
1 lock held by khungtaskd/983:
 #0: 000000001a45b635 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435
3 locks held by rs:main Q:Reg/5236:
 #0: 000000004e8b7605 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
 #1: 00000000ac46418b (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2759 [inline]
 #1: 00000000ac46418b (sb_writers#3){.+.+}, at: vfs_write+0x42a/0x560 fs/read_write.c:548
 #2: 0000000071510324 (&sb->s_type->i_mutex_key#9){+.+.}, at: inode_trylock include/linux/fs.h:758 [inline]
 #2: 0000000071510324 (&sb->s_type->i_mutex_key#9){+.+.}, at: ext4_file_write_iter+0x2a1/0x1420 fs/ext4/file.c:232
1 lock held by rsyslogd/5238:
 #0: 00000000a568f07f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/5328:
 #0: 00000000392fdb91 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000065e27bdd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5329:
 #0: 0000000041ddb0c7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000007a06dd80 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5330:
 #0: 00000000f7795cb6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000005963a661 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5331:
 #0: 00000000e26409f1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000e76daf76 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5332:
 #0: 0000000012919b2e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000002b70033a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5333:
 #0: 00000000a89ffb64 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000de6bb7d8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5334:
 #0: 00000000fe95e611 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000b3c8c2b5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
6 locks held by syz-executor280/5359:

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

NMI backtrace for cpu 1
CPU: 1 PID: 983 Comm: khungtaskd Not tainted 4.19.0-rc6+ #41
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+0x1c4/0x2b4 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 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.315 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 5359 Comm: syz-executor280 Not tainted 4.19.0-rc6+ #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_find_extent+0x149/0x9b0 fs/ext4/extents.c:894
Code: 39 e5 0f 8c c4 06 00 00 e8 b4 a8 6d ff 48 8b 45 c8 48 8d 78 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 af 07 00 00 48 8b 45 c8 48 8d 78 28 4c 89 70 20 48 b8 00 00
RSP: 0018:ffff8801ba8cf150 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82110cbe
RDX: 1ffff1003a38ecf4 RSI: ffffffff82110ccc RDI: ffff8801d1c767a0
RBP: ffff8801ba8cf1b0 R08: ffff8801ba8ac6c0 R09: 1ffffffff1273955
R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000000
R13: 0000000000000001 R14: ffff8801b6b99140 R15: ffff8801d1c76780
FS:  000000000146d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001baa0e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 get_ext_path fs/ext4/move_extent.c:31 [inline]
 mext_check_coverage.constprop.13+0x2b0/0x510 fs/ext4/move_extent.c:98
 move_extent_per_page fs/ext4/move_extent.c:323 [inline]
 ext4_move_extents+0x2784/0x3c20 fs/ext4/move_extent.c:669
 ext4_ioctl+0x3154/0x4210 fs/ext4/ioctl.c:799
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl fs/ioctl.c:707 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440169
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffeb8e88be8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440169
RDX: 0000000020000040 RSI: 00000000c028660f RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004019f0
R13: 0000000000401a80 R14: 0000000000000000 R15: 0000000000000000

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/10/03 07:26 upstream 1d2ba7fee28b 0f3e0261 .config console log report syz C ci-upstream-kasan-gce-smack-root
2018/10/12 23:00 upstream 90ad18418c2d caf12900 .config console log report ci-upstream-kasan-gce-root
2018/10/10 19:56 upstream 3d647e62686f 5b11ac2c .config console log report ci-upstream-kasan-gce-selinux-root
2018/10/08 06:15 upstream 0238df646e62 8b311eaf .config console log report ci-upstream-kasan-gce-root
2018/10/07 10:46 upstream c1d84a1b42ef 8b311eaf .config console log report ci-upstream-kasan-gce-smack-root
2018/10/03 07:33 upstream 1d2ba7fee28b 0f3e0261 .config console log report ci-upstream-kasan-gce-root
2018/09/26 03:25 upstream 846e8dd47c26 b7e11289 .config console log report ci-upstream-kasan-gce-smack-root
2018/09/23 17:32 upstream 328c6333ba3d 37079712 .config console log report ci-upstream-kasan-gce-root
2018/09/22 02:52 upstream 10dc890d4228 37079712 .config console log report ci-upstream-kasan-gce-selinux-root
2018/07/30 02:41 upstream 3cfb6772d4cf 1a381291 .config console log report ci-upstream-kasan-gce-root
2018/10/08 16:53 net-next-old abf1a08ff323 8b311eaf .config console log report ci-upstream-net-kasan-gce
2018/10/07 18:32 net-next-old 5057ef7f566d 8b311eaf .config console log report ci-upstream-net-kasan-gce
2018/09/30 00:23 linux-next 4794a36bf08d 41e4b329 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.