INFO: task systemd-udevd:9092 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28136 9092 4318 0x80000126 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1025 [inline] __lock_page+0x1c7/0x370 mm/filemap.c:1197 lock_page include/linux/pagemap.h:479 [inline] truncate_inode_pages_range+0x6de/0x12a0 mm/truncate.c:399 truncate_inode_pages+0x10/0x20 mm/truncate.c:429 kill_bdev+0xa9/0xd0 fs/block_dev.c:98 __blkdev_put+0x1f1/0x7c0 fs/block_dev.c:1797 blkdev_put+0x73/0x480 fs/block_dev.c:1868 blkdev_close+0x88/0xd0 fs/block_dev.c:1875 __fput+0x232/0x740 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x98b/0x2c90 kernel/exit.c:868 do_group_exit+0xf8/0x2c0 kernel/exit.c:965 get_signal+0x2f6/0x1ab0 kernel/signal.c:2423 do_signal+0x7f/0x18b0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11e/0x190 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f03df110210 RSP: 002b:00007ffe64f8dde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 000055f19530fbe0 RCX: 00007f03df110210 RDX: 0000000000000400 RSI: 000055f19530fc08 RDI: 000000000000000f RBP: 000055f195310cf0 R08: 00007f03df0faf68 R09: 0000000000000430 R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000055f195310d40 R15: 0000000000000400 INFO: task systemd-udevd:9176 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28136 9176 4318 0x80000126 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1025 [inline] __lock_page+0x1c7/0x370 mm/filemap.c:1197 lock_page include/linux/pagemap.h:479 [inline] truncate_inode_pages_range+0x6de/0x12a0 mm/truncate.c:399 truncate_inode_pages+0x10/0x20 mm/truncate.c:429 kill_bdev+0xa9/0xd0 fs/block_dev.c:98 __blkdev_put+0x1f1/0x7c0 fs/block_dev.c:1797 blkdev_put+0x73/0x480 fs/block_dev.c:1868 blkdev_close+0x88/0xd0 fs/block_dev.c:1875 __fput+0x232/0x740 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x98b/0x2c90 kernel/exit.c:868 do_group_exit+0xf8/0x2c0 kernel/exit.c:965 get_signal+0x2f6/0x1ab0 kernel/signal.c:2423 do_signal+0x7f/0x18b0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11e/0x190 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f03df110210 RSP: 002b:00007ffe64f8dde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 000055f195309830 RCX: 00007f03df110210 RDX: 0000000000000400 RSI: 000055f195309858 RDI: 000000000000000f RBP: 000055f1952fd820 R08: 00007f03df0faf58 R09: 0000000000000430 R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000055f1952fd870 R15: 0000000000000400 INFO: task systemd-udevd:9180 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28136 9180 4318 0x80000126 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1025 [inline] __lock_page+0x1c7/0x370 mm/filemap.c:1197 lock_page include/linux/pagemap.h:479 [inline] truncate_inode_pages_range+0x6de/0x12a0 mm/truncate.c:399 truncate_inode_pages+0x10/0x20 mm/truncate.c:429 kill_bdev+0xa9/0xd0 fs/block_dev.c:98 __blkdev_put+0x1f1/0x7c0 fs/block_dev.c:1797 blkdev_put+0x73/0x480 fs/block_dev.c:1868 blkdev_close+0x88/0xd0 fs/block_dev.c:1875 __fput+0x232/0x740 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x98b/0x2c90 kernel/exit.c:868 do_group_exit+0xf8/0x2c0 kernel/exit.c:965 get_signal+0x2f6/0x1ab0 kernel/signal.c:2423 do_signal+0x7f/0x18b0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11e/0x190 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f03df110210 RSP: 002b:00007ffe64f8dde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 000055f19530a2a0 RCX: 00007f03df110210 RDX: 0000000000000400 RSI: 000055f19530a2c8 RDI: 000000000000000f RBP: 000055f195300d20 R08: 00007f03df0faf48 R09: 0000000000000430 R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000055f195300d70 R15: 0000000000000400 INFO: task systemd-udevd:9202 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28136 9202 4318 0x80000126 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1025 [inline] __lock_page+0x1c7/0x370 mm/filemap.c:1197 lock_page include/linux/pagemap.h:479 [inline] truncate_inode_pages_range+0x6de/0x12a0 mm/truncate.c:399 truncate_inode_pages+0x10/0x20 mm/truncate.c:429 kill_bdev+0xa9/0xd0 fs/block_dev.c:98 __blkdev_put+0x1f1/0x7c0 fs/block_dev.c:1797 blkdev_put+0x73/0x480 fs/block_dev.c:1868 blkdev_close+0x88/0xd0 fs/block_dev.c:1875 __fput+0x232/0x740 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x98b/0x2c90 kernel/exit.c:868 do_group_exit+0xf8/0x2c0 kernel/exit.c:965 get_signal+0x2f6/0x1ab0 kernel/signal.c:2423 do_signal+0x7f/0x18b0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11e/0x190 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f03df110210 RSP: 002b:00007ffe64f8dde8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 000055f19530fbe0 RCX: 00007f03df110210 RDX: 0000000000000400 RSI: 000055f19530fc08 RDI: 000000000000000f RBP: 000055f19530f530 R08: 00007f03df0faf68 R09: 0000000000000430 R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000055f19530f580 R15: 0000000000000400 INFO: task systemd-udevd:9311 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28136 9311 4318 0x80000126 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1025 [inline] __lock_page+0x1c7/0x370 mm/filemap.c:1197 lock_page include/linux/pagemap.h:479 [inline] truncate_inode_pages_range+0x6de/0x12a0 mm/truncate.c:399 truncate_inode_pages+0x10/0x20 mm/truncate.c:429 kill_bdev+0xa9/0xd0 fs/block_dev.c:98 __blkdev_put+0x1f1/0x7c0 fs/block_dev.c:1797 blkdev_put+0x73/0x480 fs/block_dev.c:1868 blkdev_close+0x88/0xd0 fs/block_dev.c:1875 __fput+0x232/0x740 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x98b/0x2c90 kernel/exit.c:868 do_group_exit+0xf8/0x2c0 kernel/exit.c:965 get_signal+0x2f6/0x1ab0 kernel/signal.c:2423 do_signal+0x7f/0x18b0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11e/0x190 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f03df110210 RSP: 002b:00007ffe64f8d7f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 000055f195320150 RCX: 00007f03df110210 RDX: 0000000000000400 RSI: 000055f195320178 RDI: 000000000000000f RBP: 000055f195310cf0 R08: 00007f03df0faf68 R09: 0000000000000430 R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000055f195310d40 R15: 0000000000000400 INFO: task systemd-udevd:9373 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D27544 9373 4318 0x00000124 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 __blkdev_get+0x185/0xff0 fs/block_dev.c:1455 blkdev_get+0x265/0x890 fs/block_dev.c:1611 blkdev_open+0x19f/0x200 fs/block_dev.c:1772 do_dentry_open+0x3e4/0xde0 fs/open.c:777 vfs_open+0xfc/0x240 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0xb73/0x27a0 fs/namei.c:3569 do_filp_open+0x16b/0x220 fs/namei.c:3603 do_sys_open+0x1c2/0x340 fs/open.c:1081 SYSC_open fs/open.c:1099 [inline] SyS_open+0x19/0x20 fs/open.c:1094 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f03df110840 RSP: 002b:00007ffe64f92d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055f1952fd820 RCX: 00007f03df110840 RDX: 000055f193939fe3 RSI: 00000000000a0800 RDI: 000055f195310ef0 RBP: 00007ffe64f92f10 R08: 000055f193939670 R09: 0000000000000010 R10: 000055f193939d0c R11: 0000000000000246 R12: 00007ffe64f92e60 R13: 000055f19530f530 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.3:21115 blocked for more than 140 seconds. Not tainted 4.14.216-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28344 21115 7687 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1025 [inline] __lock_page+0x1c7/0x370 mm/filemap.c:1197 lock_page include/linux/pagemap.h:479 [inline] truncate_inode_pages_range+0x6de/0x12a0 mm/truncate.c:399 truncate_inode_pages+0x10/0x20 mm/truncate.c:429 kill_bdev+0xa9/0xd0 fs/block_dev.c:98 __blkdev_put+0x1f1/0x7c0 fs/block_dev.c:1797 blkdev_put+0x73/0x480 fs/block_dev.c:1868 blkdev_close+0x88/0xd0 fs/block_dev.c:1875 __fput+0x232/0x740 fs/file_table.c:210 ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x14a/0x190 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:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x417811 RSP: 002b:00007fff87abb090 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000417811 RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000001190440 R09: 0000000000000000 R10: 00007fff87abb160 R11: 0000000000000293 R12: ffffffffffffffff R13: 0000000000000000 R14: 0000000000000003 R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1529: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7116: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x8e/0xc0 fs/file.c:769 1 lock held by systemd-udevd/9092: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xf0/0x7c0 fs/block_dev.c:1790 1 lock held by systemd-udevd/9176: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xf0/0x7c0 fs/block_dev.c:1790 1 lock held by systemd-udevd/9180: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xf0/0x7c0 fs/block_dev.c:1790 1 lock held by systemd-udevd/9202: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xf0/0x7c0 fs/block_dev.c:1790 1 lock held by systemd-udevd/9311: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xf0/0x7c0 fs/block_dev.c:1790 1 lock held by systemd-udevd/9373: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x185/0xff0 fs/block_dev.c:1455 1 lock held by syz-executor.3/21115: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xf0/0x7c0 fs/block_dev.c:1790 1 lock held by syz-executor863/21207: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x185/0xff0 fs/block_dev.c:1455 1 lock held by syz-executor863/21208: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x185/0xff0 fs/block_dev.c:1455 1 lock held by syz-executor863/21209: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x185/0xff0 fs/block_dev.c:1455 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1529 Comm: khungtaskd Not tainted 4.14.216-syzkaller #0 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+0x14b/0x1e7 lib/dump_stack.c:58 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 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:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x51b/0xa70 kernel/hung_task.c:274 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 34 Comm: kworker/u4:2 Not tainted 4.14.216-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff8881f4e6e1c0 task.stack: ffff8881f4ec8000 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:796 [inline] RIP: 0010:lock_release+0xbf/0x820 kernel/locking/lockdep.c:4013 RSP: 0018:ffff8881f4ecfc68 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff1103e9d9f90 RCX: 1ffffffff1194bac RDX: 1ffffffff11e1098 RSI: 0000000000000001 RDI: ffffffff88f084c0 RBP: ffff8881f4ecfd08 R08: ffff8881f4e6eab8 R09: 0000000000000000 R10: 0000000000000050 R11: ffff8881f4e6e1c0 R12: ffffffff88f76300 R13: ffff8881f4e6e1c0 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91e085f858 CR3: 0000000008e6a004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:685 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:420 [inline] batadv_nc_worker+0x194/0x630 net/batman-adv/network-coding.c:726 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116 worker_thread+0xcc/0xed0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 8b 8d 84 08 00 00 45 85 c9 0f 85 a8 03 00 00 48 c7 c7 c0 84 f0 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 72 06 00 00 48 83 3d 83 b1 ae 07 00 0f 84 31 05 00 00 9c