kworker/u4:3(2487): getblk(): executed=9 bh_count=0 bh_state=0 kworker/u4:3(2487): getblk(): executed=9 bh_count=0 bh_state=0 kworker/u4:3(2487): getblk(): executed=9 bh_count=0 bh_state=0 kworker/u4:3(2487): getblk(): executed=9 bh_count=0 bh_state=0 kworker/u4:3(2487): getblk(): executed=9 bh_count=0 bh_state=0 INFO: task syz-executor2:16754 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #190 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D23560 16754 8072 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 wb_wait_for_completion+0x1f9/0x2d0 fs/fs-writeback.c:221 sync_inodes_sb+0x33e/0x480 fs/fs-writeback.c:2417 sync_inodes_one_sb+0x59/0x70 fs/sync.c:74 iterate_supers+0x149/0x290 fs/super.c:724 ksys_sync+0xec/0x1e0 fs/sync.c:113 __ia32_sys_sync+0xe/0x20 fs/sync.c:124 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: Bad RIP value. RSP: 002b:00007f3a0c7bdc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 000000000073bf08 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3a0c7be6d4 R13: 00000000004c408d R14: 00000000004dacd8 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 000000009875c2bc (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4389 4 locks held by kworker/u4:3/2487: 1 lock held by rsyslogd/7941: #0: 000000005f18baf4 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:795 2 locks held by getty/8031: #0: 000000008cbaca34 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001492a07e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8032: #0: 000000001e7edcc4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000063bf5c0f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8033: #0: 000000000cb66cf1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009b63cedb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8034: #0: 000000002dcf1a09 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006d2913f2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8035: #0: 0000000075dcb7c7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000090bc08cc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8036: #0: 000000003c0d5c61 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000042d20527 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8037: #0: 00000000b099c13e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003f957be6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 1 lock held by syz-executor2/16754: #0: 000000009972b29b (&fc->fs_type->s_umount_key#66){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:722 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 4.20.0-rc7-next-20181224 #190 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+0x1d3/0x2c6 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xba1/0x11a0 kernel/hung_task.c:287 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9291 Comm: kworker/u4:7 Not tainted 4.20.0-rc7-next-20181224 #190 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:find_held_lock+0x158/0x1c0 kernel/locking/lockdep.c:3464 Code: 60 75 4c 4c 89 e3 4c 89 f6 48 89 df e8 f1 f5 ff ff 85 c0 74 89 49 89 dc 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 28 48 8b 45 d0 44 89 38 48 83 c4 RSP: 0018:ffff888059dbf430 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: 1ffff1100b3b7e94 RCX: ffff888059dbf4c0 RDX: 1ffff1100b3b7e98 RSI: 0000000000000000 RDI: ffff8880599a6c60 RBP: ffff888059dbf468 R08: 0000000000000000 R09: ffffed1015cc5b8f R10: 0000000000000003 R11: ffff8880ae62dc7b R12: ffff8880599a6c50 R13: ffff888059dbf580 R14: ffffffff8979f040 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000099d6f000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000106000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_release kernel/locking/lockdep.c:3599 [inline] lock_release+0x2a7/0xa00 kernel/locking/lockdep.c:3860 rcu_lock_release include/linux/rcupdate.h:228 [inline] rcu_read_unlock include/linux/rcupdate.h:661 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:423 [inline] batadv_nc_worker+0x32e/0x920 net/batman-adv/network-coding.c:730 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352