INFO: task syz-executor.0:15742 blocked for more than 143 seconds. Not tainted 5.2.0-rc4-next-20190614 #15 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D24456 15742 1 0x80004004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7c5/0x1560 kernel/sched/core.c:3444 schedule+0xa8/0x260 kernel/sched/core.c:3508 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3567 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 acct_get kernel/acct.c:161 [inline] slow_acct_process kernel/acct.c:577 [inline] acct_process+0x2e5/0x61e kernel/acct.c:605 do_exit+0x17bb/0x2fa0 kernel/exit.c:867 do_group_exit+0x135/0x360 kernel/exit.c:981 get_signal+0x463/0x2490 kernel/signal.c:2728 do_signal+0x87/0x1990 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x41325a Code: 48 89 04 24 e8 47 19 01 00 48 8b 44 24 08 48 8b 4c 24 40 48 89 41 48 48 8b 44 24 18 48 a9 1f 00 00 00 75 65 48 c1 e8 05 48 8b <4c> 24 10 48 83 f9 08 75 28 48 ff c8 48 8b 4c 24 30 48 89 ca 48 29 RSP: 002b:00007ffe3e8cbdb8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 000000000041325a RDX: 0000000040000000 RSI: 00007ffe3e8cbdf0 RDI: ffffffffffffffff RBP: 0000000000003332 R08: 0000000000000001 R09: 0000555556baa940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe3e8cbdf0 R14: 00000000002b3993 R15: 00007ffe3e8cbe00 Showing all locks held in the system: 1 lock held by khungtaskd/1045: #0: 000000005aa22590 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 2 locks held by rsyslogd/8662: #0: 00000000ea01539b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: 000000006bd4a5a2 (logbuf_lock){-.-.}, at: is_bpf_text_address+0x0/0x170 kernel/bpf/core.c:695 2 locks held by getty/8754: #0: 000000007fe223bd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000081f035eb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8755: #0: 0000000031a9ecd2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002ee573ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8756: #0: 00000000fdf203e0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000066b15fb3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8757: #0: 00000000112c409b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008fc2d945 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8758: #0: 00000000121c2f44 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002b9e0eea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8759: #0: 000000003b77efbc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b50e6c4f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8760: #0: 000000000b79265c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001469d91e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/15742: #0: 000000005687bd72 (&acct->lock#2){+.+.}, at: acct_get kernel/acct.c:161 [inline] #0: 000000005687bd72 (&acct->lock#2){+.+.}, at: slow_acct_process kernel/acct.c:577 [inline] #0: 000000005687bd72 (&acct->lock#2){+.+.}, at: acct_process+0x2e5/0x61e kernel/acct.c:605 2 locks held by kworker/u4:8/11814: #0: 0000000051c32bed (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9741 [inline] #0: 0000000051c32bed (&rq->lock){-.-.}, at: pick_next_task_fair+0x11d0/0x1920 kernel/sched/fair.c:6788 #1: 000000005aa22590 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:5785 3 locks held by syz-executor.0/31306: #0: 000000005687bd72 (&acct->lock#2){+.+.}, at: acct_get kernel/acct.c:161 [inline] #0: 000000005687bd72 (&acct->lock#2){+.+.}, at: slow_acct_process kernel/acct.c:577 [inline] #0: 000000005687bd72 (&acct->lock#2){+.+.}, at: acct_process+0x2e5/0x61e kernel/acct.c:605 #1: 00000000b3667bb6 (sb_writers#3){.+.+}, at: file_start_write_trylock include/linux/fs.h:2848 [inline] #1: 00000000b3667bb6 (sb_writers#3){.+.+}, at: do_acct_process+0xf29/0x1140 kernel/acct.c:517 #2: 0000000033e4d615 (&sb->s_type->i_mutex_key#10){++++}, at: inode_trylock include/linux/fs.h:798 [inline] #2: 0000000033e4d615 (&sb->s_type->i_mutex_key#10){++++}, at: ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1045 Comm: khungtaskd Not tainted 5.2.0-rc4-next-20190614 #15 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:249 [inline] watchdog+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11814 Comm: kworker/u4:8 Not tainted 5.2.0-rc4-next-20190614 #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:debug_smp_processor_id+0x4/0x2b0 lib/smp_processor_id.c:56 Code: 89 e8 00 c8 73 fe e9 ec fe ff ff 4c 89 ef e8 13 c8 73 fe e9 71 fe ff ff e8 09 c8 73 fe e9 45 fe ff ff 0f 1f 40 00 55 48 89 e5 <41> 56 41 55 41 54 53 e8 60 bd 3a fe 65 44 8b 25 c8 50 cb 7c 65 8b RSP: 0018:ffff888071327b00 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000607f514341a0 RCX: 0000000000000005 RDX: 1ffffffff11b16cf RSI: ffffffff88da3b80 RDI: ffffffff88d8b678 RBP: ffff888071327b00 R08: 0000000000000000 R09: ffffed1015d26be0 R10: ffffed1015d26bdf R11: ffff8880ae935efb R12: 1ffff1100e264f68 R13: 000000000000000d R14: ffffffff88d8b600 R15: ffff888071327bc0 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009b637000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_trace_lock+0xeb/0x4c0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x5c5/0xa50 kernel/locking/lockdep.c:4436 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:647 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:411 [inline] batadv_nc_worker+0x225/0x760 net/batman-adv/network-coding.c:718 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352