INFO: task syz-executor.4:30261 blocked for more than 140 seconds. Not tainted 5.0.0-rc8+ #89 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29552 30261 7663 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 schedule_timeout+0x8ca/0xfd0 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136 __do_sys_io_destroy fs/aio.c:1390 [inline] __se_sys_io_destroy fs/aio.c:1368 [inline] __x64_sys_io_destroy+0x373/0x420 fs/aio.c:1368 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: 24 28 48 89 4c 24 08 66 c7 44 24 10 01 01 48 c7 44 24 18 00 00 00 00 e8 a5 b0 fc ff 48 8b 44 24 38 48 89 04 24 e8 d7 77 fb ff <48> 8b 6c 24 40 48 83 c4 48 c3 48 89 d1 eb 90 e8 73 20 00 00 e9 7e RSP: 002b:00007f9e4f98dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000cf RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457e29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f9e4f92d000 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9e4f98e6d4 R13: 00000000004bf000 R14: 00000000004d0950 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1039: #0: 00000000a5728666 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4389 3 locks held by kworker/u4:3/1125: #0: 0000000073b9ba60 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1149 [inline] #0: 0000000073b9ba60 (&rq->lock){-.-.}, at: __schedule+0x1fc/0x1cc0 kernel/sched/core.c:3423 #1: 00000000a5728666 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:6014 #2: 00000000a5728666 (rcu_read_lock){....}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:417 [inline] #2: 00000000a5728666 (rcu_read_lock){....}, at: batadv_nc_worker+0xe3/0x760 net/batman-adv/network-coding.c:730 3 locks held by rs:main Q:Reg/7518: #0: 00000000f147ad09 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:795 #1: 00000000f139e26f (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2816 [inline] #1: 00000000f139e26f (sb_writers#3){.+.+}, at: vfs_write+0x429/0x580 fs/read_write.c:548 #2: 00000000ef372bd9 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_lock include/linux/fs.h:757 [inline] #2: 00000000ef372bd9 (&sb->s_type->i_mutex_key#10){+.+.}, at: __generic_file_fsync+0xb5/0x200 fs/libfs.c:981 1 lock held by rsyslogd/7520: #0: 0000000017f88151 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:795 2 locks held by getty/7611: #0: 0000000073398a2d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008d7fe012 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7612: #0: 0000000085b699ee (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000091303d77 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7613: #0: 00000000a12b06c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006afd871c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7614: #0: 000000007f046155 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a84ffc0e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7615: #0: 000000006f3f0b8d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000aed79ede (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7616: #0: 0000000045e85e9d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006fe01981 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7617: #0: 00000000816f01ba (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c327c9ff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1039 Comm: khungtaskd Not tainted 5.0.0-rc8+ #89 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:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7518 Comm: rs:main Q:Reg Not tainted 5.0.0-rc8+ #89 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_release kernel/locking/lockdep.c:3584 [inline] RIP: 0010:lock_release+0x187/0xa00 kernel/locking/lockdep.c:3860 Code: 00 01 00 00 00 e9 96 03 00 00 65 8b 05 32 37 aa 7e 83 f8 3f 0f 87 12 05 00 00 89 c0 48 0f a3 05 cf 2f 05 08 0f 82 3c 04 00 00 <48> c7 c0 f8 ab 5c 89 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 RSP: 0018:ffff88808707f360 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 1ffff11010e0fe72 RCX: 1ffffffff12b957f RDX: 0000000000000001 RSI: 1ffffffff10dcc0d RDI: ffff8880971f4c3c RBP: ffff88808707f418 R08: ffff8880971f43c0 R09: ffffed1015d25bd0 R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: ffffffff889a41c0 R13: ffffffff831777ac R14: dffffc0000000000 R15: ffff88808707f3f0 FS: 00007fe75f312700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c423cf1000 CR3: 0000000094590000 CR4: 00000000001406e0 DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:228 [inline] rcu_read_unlock_sched include/linux/rcupdate.h:736 [inline] percpu_ref_tryget_live include/linux/percpu-refcount.h:261 [inline] blk_queue_enter+0x609/0xe90 block/blk-core.c:406 generic_make_request+0x532/0x12d0 block/blk-core.c:1025 submit_bio+0xba/0x480 block/blk-core.c:1198 submit_bh_wbc+0x5f7/0x7f0 fs/buffer.c:3088 submit_bh fs/buffer.c:3094 [inline] __sync_dirty_buffer+0x111/0x2e0 fs/buffer.c:3180 sync_dirty_buffer+0x1b/0x20 fs/buffer.c:3193 ext4_write_inode+0x475/0x510 fs/ext4/inode.c:5439 write_inode fs/fs-writeback.c:1209 [inline] __writeback_single_inode+0xc9b/0x12f0 fs/fs-writeback.c:1408 writeback_single_inode+0x2cf/0x440 fs/fs-writeback.c:1462 sync_inode fs/fs-writeback.c:2499 [inline] sync_inode_metadata+0xa8/0xe0 fs/fs-writeback.c:2519 __generic_file_fsync+0x169/0x200 fs/libfs.c:988 ext4_sync_file+0x867/0x14d0 fs/ext4/fsync.c:120 vfs_fsync_range+0x144/0x230 fs/sync.c:197 generic_write_sync include/linux/fs.h:2787 [inline] ext4_file_write_iter+0x699/0x1160 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1863 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x613/0x8e0 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe760d7019d Code: d1 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be fa ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 07 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fe75f311000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000000000c1 RCX: 00007fe760d7019d RDX: 00000000000000c1 RSI: 00000000009cfa90 RDI: 0000000000000005 RBP: 00000000009cfa90 R08: 00000000009cfafe R09: 00007fe7606eccb7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fe75f311480 R14: 000000000000000e R15: 00000000009cf890