INFO: task jbd2/sda1-8:3307 blocked for more than 140 seconds. Not tainted 4.19.0-rc4-next-20180921+ #77 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D18264 3307 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2830 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3479 schedule+0xfe/0x460 kernel/sched/core.c:3523 jbd2_journal_commit_transaction+0xd38/0x89da fs/jbd2/commit.c:435 kjournald2+0x26d/0xb30 fs/jbd2/journal.c:229 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Showing all locks held in the system: 4 locks held by kworker/u4:2/28: #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000966b2f63 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xb43/0x1b80 kernel/workqueue.c:2124 #1: 00000000544b3bff ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb9a/0x1b80 kernel/workqueue.c:2128 #2: 000000008f6094aa (&fc->fs_type->s_umount_key#30){++++}, at: trylock_super+0x22/0x110 fs/super.c:411 #3: 00000000e88adbe2 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 mm/page-writeback.c:2340 1 lock held by khungtaskd/983: #0: 000000004a02f480 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435 3 locks held by rs:main Q:Reg/5445: #0: 0000000076c9764a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 #1: 000000004aae268a (sb_writers#5){.+.+}, at: file_start_write include/linux/fs.h:2784 [inline] #1: 000000004aae268a (sb_writers#5){.+.+}, at: vfs_write+0x42a/0x560 fs/read_write.c:548 #2: 0000000092898058 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_trylock include/linux/fs.h:770 [inline] #2: 0000000092898058 (&sb->s_type->i_mutex_key#12){+.+.}, at: ext4_file_write_iter+0x2a1/0x1420 fs/ext4/file.c:232 1 lock held by rsyslogd/5448: #0: 000000000182ebfe (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5537: #0: 000000002db97c95 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c978bc9a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5538: #0: 0000000026d5a3f0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000858cc8d0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5539: #0: 000000004b6a537d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000092120c7f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5540: #0: 0000000032437300 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000af9d3d4d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5541: #0: 000000003cb32a3a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000089bab666 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5542: #0: 0000000084a4d130 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000764db77e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5543: #0: 00000000c92252aa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000009cc43f77 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 6 locks held by syz-executor386/5564: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 983 Comm: khungtaskd Not tainted 4.19.0-rc4-next-20180921+ #77 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+0x1d3/0x2c4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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+0xb39/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.188 msecs NMI backtrace for cpu 1 CPU: 1 PID: 5564 Comm: syz-executor386 Not tainted 4.19.0-rc4-next-20180921+ #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_ext_drop_refs+0xc0/0xf0 fs/ext4/extents.c:723 Code: 03 00 00 00 00 e8 70 31 6c ff 41 83 c4 01 44 89 f7 48 83 c3 30 44 89 e6 e8 ed 31 6c ff 45 39 e6 7d a6 e8 53 31 6c ff 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 e8 a3 aa af ff e9 76 ff ff ff 48 89 df e8 RSP: 0018:ffff8801be77f198 EFLAGS: 00000293 RAX: ffff8801d8708580 RBX: ffff8801be363a80 RCX: ffffffff82111fd3 RDX: 0000000000000000 RSI: ffffffff82111fdd RDI: 0000000000000004 RBP: ffff8801be77f1b0 R08: ffff8801d8708580 R09: ffffed003b585b57 R10: ffffed003b585b57 R11: ffff8801dac2dabb R12: 0000000000008002 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000b12880(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d8736000 CR4: 00000000001406e0 Call Trace: mext_check_coverage.constprop.13+0x27b/0x510 fs/ext4/move_extent.c:105 move_extent_per_page fs/ext4/move_extent.c:323 [inline] ext4_move_extents+0x2784/0x3c20 fs/ext4/move_extent.c:669 ext4_ioctl+0x314f/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:00007ffe0bdc36e8 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