INFO: task blkid:28277 blocked for more than 120 seconds. Not tainted 4.16.0-rc5+ #267 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D20400 28277 4219 0x80000006 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 io_schedule+0x1c/0x70 kernel/sched/core.c:5115 wait_on_page_bit_common mm/filemap.c:1099 [inline] __lock_page+0x574/0x720 mm/filemap.c:1272 lock_page include/linux/pagemap.h:483 [inline] truncate_inode_pages_range+0x197c/0x1fe0 mm/truncate.c:448 truncate_inode_pages+0x24/0x30 mm/truncate.c:478 kill_bdev+0xbc/0xf0 fs/block_dev.c:86 __blkdev_put+0x198/0x760 fs/block_dev.c:1782 blkdev_put+0x85/0x4f0 fs/block_dev.c:1850 blkdev_close+0x8b/0xb0 fs/block_dev.c:1857 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe153d5e310 RSP: 002b:00007fff8cf2dac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007fe153d5e310 RDX: 0000000000000400 RSI: 0000000000afcc58 RDI: 0000000000000003 RBP: 0000000000afcc30 R08: 0000000000000028 R09: 0000000001680000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000afc030 R13: 0000000000000400 R14: 0000000000afc080 R15: 0000000000afcc48 Showing all locks held in the system: 2 locks held by khungtaskd/801: #0: (rcu_read_lock){....}, at: [<000000004b9ecfb2>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<000000004b9ecfb2>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<0000000009fdd7f0>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 2 locks held by getty/4208: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4209: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4210: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4211: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4212: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4213: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4214: #0: (&tty->ldisc_sem){++++}, at: [<00000000e5f0829b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b4f329a4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 1 lock held by blkid/28277: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000c521f033>] __blkdev_put+0xbc/0x760 fs/block_dev.c:1775 1 lock held by syz-executor2/31885: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000cebc3c9e>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2160 1 lock held by syz-executor2/31889: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000cebc3c9e>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2160 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 801 Comm: khungtaskd Not tainted 4.16.0-rc5+ #267 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 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:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4085 Comm: rsyslogd Not tainted 4.16.0-rc5+ #267 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_acquire+0x26d/0x580 kernel/locking/lockdep.c:3909 RSP: 0018:ffff8801b69675b8 EFLAGS: 00000082 RAX: dffffc0000000000 RBX: ffff8801b6c4c280 RCX: 0000000000000000 RDX: 1ffffffff0dd937d RSI: 00000000e762a938 RDI: 0000000000000082 RBP: ffff8801b69676b0 R08: 1ffff10036d2ce1b R09: 000000000000000a R10: ffff8801b6967598 R11: 0000000000000000 R12: 1ffff10036d2cebd R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 FS: 00007f0bf18f4700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001cc2f4004 CR4: 00000000001626f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:244 [inline] rcu_read_lock include/linux/rcupdate.h:630 [inline] avc_reclaim_node security/selinux/avc.c:527 [inline] avc_alloc_node+0x25f/0x4d0 security/selinux/avc.c:557 avc_insert security/selinux/avc.c:668 [inline] avc_compute_av+0x22a/0x710 security/selinux/avc.c:974 avc_has_perm_noaudit security/selinux/avc.c:1110 [inline] avc_has_perm+0x4be/0x680 security/selinux/avc.c:1144 selinux_syslog+0x239/0x2a0 security/selinux/hooks.c:2293 security_syslog+0x6d/0xa0 security/security.c:299 check_syslog_permissions+0x59/0x100 kernel/printk/printk.c:682 do_syslog+0x82/0xb80 kernel/printk/printk.c:1439 kmsg_read+0x74/0xa0 fs/proc/kmsg.c:40 proc_reg_read+0xe8/0x160 fs/proc/inode.c:218 __vfs_read+0xef/0xa00 fs/read_write.c:411 vfs_read+0x11e/0x350 fs/read_write.c:447 SYSC_read fs/read_write.c:573 [inline] SyS_read+0xef/0x220 fs/read_write.c:566 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f0bf43541fd RSP: 002b:00007f0bf18f3e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000001dc34b0 RCX: 00007f0bf43541fd RDX: 0000000000000fff RSI: 00007f0bf31285a0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000001dae260 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 000000000065e420 R13: 00007f0bf18f49c0 R14: 00007f0bf4999040 R15: 0000000000000003 Code: 81 6a 95 05 00 0f 84 d1 01 00 00 48 8b bd 20 ff ff ff 57 9d 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00 00 <4a> c7 44 20 08 00 00 00 00 42 c7 44 20 10 00 00 00 00 48 8d 65