INFO: task syz-executor.0:2207 can't die for more than 143 seconds. syz-executor.0 D28072 2207 8653 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4069 schedule+0xd9/0x260 kernel/sched/core.c:4136 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871 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 flush_workqueue+0x40a/0x14c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1272 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0xb2e/0xc44 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0xedb/0x1c20 block/ioctl.c:606 block_ioctl+0xee/0x130 fs/block_dev.c:1954 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:539 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:726 ksys_ioctl+0xab/0xd0 fs/ioctl.c:743 __do_sys_ioctl fs/ioctl.c:750 [inline] __se_sys_ioctl fs/ioctl.c:748 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:748 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <90> 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00007f6b9fecfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a59 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6b9fed06d4 R13: 00000000004c3381 R14: 00000000004d6f90 R15: 00000000ffffffff INFO: task syz-executor.0:2207 blocked for more than 143 seconds. Not tainted 5.4.0-rc2-next-20191010 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28072 2207 8653 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4069 schedule+0xd9/0x260 kernel/sched/core.c:4136 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871 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 flush_workqueue+0x40a/0x14c0 kernel/workqueue.c:2826 nbd_start_device_ioctl drivers/block/nbd.c:1272 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0xb2e/0xc44 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:304 [inline] blkdev_ioctl+0xedb/0x1c20 block/ioctl.c:606 block_ioctl+0xee/0x130 fs/block_dev.c:1954 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:539 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:726 ksys_ioctl+0xab/0xd0 fs/ioctl.c:743 __do_sys_ioctl fs/ioctl.c:750 [inline] __se_sys_ioctl fs/ioctl.c:748 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:748 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <90> 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00007f6b9fecfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a59 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6b9fed06d4 R13: 00000000004c3381 R14: 00000000004d6f90 R15: 00000000ffffffff INFO: task syz-executor.0:2246 can't die for more than 144 seconds. syz-executor.0 D26280 2246 8653 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4069 schedule+0xd9/0x260 kernel/sched/core.c:4136 io_schedule+0x1c/0x70 kernel/sched/core.c:5780 wait_on_page_bit_common mm/filemap.c:1174 [inline] wait_on_page_bit mm/filemap.c:1223 [inline] wait_on_page_locked include/linux/pagemap.h:527 [inline] wait_on_page_read mm/filemap.c:2746 [inline] do_read_cache_page+0xf2f/0x2140 mm/filemap.c:2789 read_cache_page+0x5e/0x70 mm/filemap.c:2873 read_mapping_page include/linux/pagemap.h:396 [inline] read_dev_sector+0x71/0x310 block/partition-generic.c:667 read_part_sector block/partitions/check.h:38 [inline] adfspart_check_ICS+0x12d/0xc90 block/partitions/acorn.c:361 check_partition+0x3bc/0x6ce block/partitions/check.c:167 rescan_partitions+0x230/0xa30 block/partition-generic.c:531 __blkdev_get+0x11fc/0x1600 fs/block_dev.c:1637 blkdev_get+0x47/0x2c0 fs/block_dev.c:1707 blkdev_open+0x205/0x290 fs/block_dev.c:1846 do_dentry_open+0x4df/0x1250 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3412 [inline] path_openat+0x10e4/0x4710 fs/namei.c:3529 do_filp_open+0x1a1/0x280 fs/namei.c:3559 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1110 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413941 Code: 48 8b 1b 48 89 5c 24 18 48 89 3c 24 89 4c 24 08 48 89 44 24 10 48 8b 44 24 68 48 89 44 24 20 48 89 54 24 28 48 8d 46 04 48 89 <44> 24 30 e8 27 01 00 00 48 8b 6c 24 48 48 83 c4 50 c3 48 8b 03 48 RSP: 002b:00007f6b9fe8d7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413941 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f6b9fe8d850 RBP: 000000000075c070 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f6b9fe8e6d4 R13: 00000000004c915f R14: 00000000004e0668 R15: 00000000ffffffff INFO: task syz-executor.0:2246 blocked for more than 144 seconds. Not tainted 5.4.0-rc2-next-20191010 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D26280 2246 8653 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4069 schedule+0xd9/0x260 kernel/sched/core.c:4136 io_schedule+0x1c/0x70 kernel/sched/core.c:5780 wait_on_page_bit_common mm/filemap.c:1174 [inline] wait_on_page_bit mm/filemap.c:1223 [inline] wait_on_page_locked include/linux/pagemap.h:527 [inline] wait_on_page_read mm/filemap.c:2746 [inline] do_read_cache_page+0xf2f/0x2140 mm/filemap.c:2789 read_cache_page+0x5e/0x70 mm/filemap.c:2873 read_mapping_page include/linux/pagemap.h:396 [inline] read_dev_sector+0x71/0x310 block/partition-generic.c:667 read_part_sector block/partitions/check.h:38 [inline] adfspart_check_ICS+0x12d/0xc90 block/partitions/acorn.c:361 check_partition+0x3bc/0x6ce block/partitions/check.c:167 rescan_partitions+0x230/0xa30 block/partition-generic.c:531 __blkdev_get+0x11fc/0x1600 fs/block_dev.c:1637 blkdev_get+0x47/0x2c0 fs/block_dev.c:1707 blkdev_open+0x205/0x290 fs/block_dev.c:1846 do_dentry_open+0x4df/0x1250 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3412 [inline] path_openat+0x10e4/0x4710 fs/namei.c:3529 do_filp_open+0x1a1/0x280 fs/namei.c:3559 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1110 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413941 Code: 48 8b 1b 48 89 5c 24 18 48 89 3c 24 89 4c 24 08 48 89 44 24 10 48 8b 44 24 68 48 89 44 24 20 48 89 54 24 28 48 8d 46 04 48 89 <44> 24 30 e8 27 01 00 00 48 8b 6c 24 48 48 83 c4 50 c3 48 8b 03 48 RSP: 002b:00007f6b9fe8d7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413941 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f6b9fe8d850 RBP: 000000000075c070 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f6b9fe8e6d4 R13: 00000000004c915f R14: 00000000004e0668 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1056: #0: ffffffff88fab6c0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5336 3 locks held by kworker/u4:4/2824: #0: ffff8880ae934d58 (&rq->lock){-.-.}, at: newidle_balance+0xa28/0xe80 kernel/sched/fair.c:9825 #1: ffffffff88fab6c0 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:5833 #2: ffff8880ae924c58 (&base->lock){-.-.}, at: lock_timer_base+0x56/0x1b0 kernel/time/timer.c:936 1 lock held by rsyslogd/8522: #0: ffff8880995a0b20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8612: #0: ffff8880a7caa090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8613: #0: ffff8880a0fb1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8614: #0: ffff8880a098d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8615: #0: ffff88808cc13090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8616: #0: ffff8880916f0090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f2d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8617: #0: ffff8880914d7090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8618: #0: ffff888099132090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005ef92e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 3 locks held by kworker/1:3/8667: #0: ffff8880ae934d58 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #0: ffff8880ae934d58 (&rq->lock){-.-.}, at: __schedule+0x266/0x1e70 kernel/sched/core.c:4017 #1: ffffffff88fab6c0 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:435 [inline] #1: ffffffff88fab6c0 (rcu_read_lock){....}, at: update_curr+0x2ea/0x8d0 kernel/sched/fair.c:860 #2: ffff8880ae925d18 (&base->lock){-.-.}, at: lock_timer_base+0x56/0x1b0 kernel/time/timer.c:936 2 locks held by kworker/u5:1/8938: #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: ffff88809783b528 ((wq_completion)knbd0-recv){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240 #1: ffff88805a127dc0 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244 1 lock held by syz-executor.0/2246: #0: ffff888095412138 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x1600 fs/block_dev.c:1553 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 5.4.0-rc2-next-20191010 #0 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+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:269 [inline] watchdog+0xc8f/0x1350 kernel/hung_task.c:353 kthread+0x361/0x430 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: 8667 Comm: kworker/1:3 Not tainted 5.4.0-rc2-next-20191010 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:lock_is_held_type+0x10/0x320 kernel/locking/lockdep.c:4513 Code: 75 d0 e8 f3 f1 55 00 48 8b 75 d0 e9 1f fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 57 <41> 56 49 89 fe 41 55 41 54 65 4c 8b 24 25 80 fe 01 00 49 8d bc 24 RSP: 0018:ffff888060f9fc00 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff138cc56 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff88fab640 RBP: ffff888060f9fc08 R08: 0000000000000003 R09: ffff888060f94d18 R10: fffffbfff138c618 R11: ffffffff89c630c7 R12: ffffffff884bcf80 R13: 000000000000050f R14: 0000000000019be5 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000099dee000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:361 [inline] ___might_sleep+0x205/0x2c0 kernel/sched/core.c:6745 gc_worker+0x759/0xdd0 net/netfilter/nf_conntrack_core.c:1295 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352