INFO: task syz-executor794:9636 can't die for more than 143 seconds. syz-executor794 R running task 27336 9636 9634 0x00004006 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4070 schedule+0xdc/0x2b0 kernel/sched/core.c:4144 io_schedule+0x1c/0x70 kernel/sched/core.c:5788 INFO: task syz-executor794:9641 can't die for more than 144 seconds. syz-executor794 D26312 9641 9640 0x00004006 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4070 INFO: task syz-executor794:9642 can't die for more than 145 seconds. syz-executor794 D27208 9642 9639 0x00004006 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4070 schedule+0xdc/0x2b0 kernel/sched/core.c:4144 io_schedule+0x1c/0x70 kernel/sched/core.c:5788 rq_qos_wait+0x301/0x3f0 block/blk-rq-qos.c:288 __wbt_wait block/blk-wbt.c:526 [inline] wbt_wait+0x20b/0x370 block/blk-wbt.c:591 __rq_qos_throttle+0x56/0xa0 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_make_request+0x3d0/0x2280 block/blk-mq.c:1938 generic_make_request block/blk-core.c:1099 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1041 submit_bio+0x113/0x600 block/blk-core.c:1225 blk_next_bio+0x4a/0x60 block/blk-lib.c:19 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:284 blkdev_issue_zeroout+0x434/0x4c0 block/blk-lib.c:378 blkdev_fallocate+0x2fc/0x410 fs/block_dev.c:2092 vfs_fallocate+0x4aa/0xa50 fs/open.c:309 ksys_fallocate+0x58/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:338 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441269 Code: 66 69 67 20 69 73 20 6e 6f 74 20 63 6c 65 61 6e 2e 0a 43 68 65 63 6b 20 65 72 72 6f 72 20 6c 6f 67 20 66 6f 72 20 64 65 74 61 <69> 6c 73 2c 20 66 69 78 20 65 72 72 6f 72 73 20 61 6e 64 20 72 65 RSP: 002b:00007ffd69dd18c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000400000000200 R11: 0000000000000246 R12: 0000000000401fe0 R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor794:9643 can't die for more than 146 seconds. syz-executor794 D27336 9643 9637 0x00004006 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4070 schedule+0xdc/0x2b0 kernel/sched/core.c:4144 io_schedule+0x1c/0x70 kernel/sched/core.c:5788 rq_qos_wait+0x301/0x3f0 block/blk-rq-qos.c:288 __wbt_wait block/blk-wbt.c:526 [inline] wbt_wait+0x20b/0x370 block/blk-wbt.c:591 __rq_qos_throttle+0x56/0xa0 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_make_request+0x3d0/0x2280 block/blk-mq.c:1938 generic_make_request block/blk-core.c:1099 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1041 submit_bio+0x113/0x600 block/blk-core.c:1225 blk_next_bio+0x4a/0x60 block/blk-lib.c:19 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:284 blkdev_issue_zeroout+0x434/0x4c0 block/blk-lib.c:378 blkdev_fallocate+0x2fc/0x410 fs/block_dev.c:2092 vfs_fallocate+0x4aa/0xa50 fs/open.c:309 ksys_fallocate+0x58/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:338 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441269 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd69dd18c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000400000000200 R11: 0000000000000246 R12: 0000000000401fe0 R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor794:9644 can't die for more than 148 seconds. syz-executor794 R27256 9644 9635 0x0000400e Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4070 schedule+0xdc/0x2b0 kernel/sched/core.c:4144 io_schedule+0x1c/0x70 kernel/sched/core.c:5788 rq_qos_wait+0x301/0x3f0 block/blk-rq-qos.c:288 __wbt_wait block/blk-wbt.c:526 [inline] wbt_wait+0x20b/0x370 block/blk-wbt.c:591 __rq_qos_throttle+0x56/0xa0 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_make_request+0x3d0/0x2280 block/blk-mq.c:1938 generic_make_request block/blk-core.c:1099 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1041 submit_bio+0x113/0x600 block/blk-core.c:1225 blk_next_bio+0x4a/0x60 block/blk-lib.c:19 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:284 blkdev_issue_zeroout+0x434/0x4c0 block/blk-lib.c:378 blkdev_fallocate+0x2fc/0x410 fs/block_dev.c:2092 vfs_fallocate+0x4aa/0xa50 fs/open.c:309 ksys_fallocate+0x58/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:338 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441269 Code: 66 69 67 20 69 73 20 6e 6f 74 20 63 6c 65 61 6e 2e 0a 43 68 65 63 6b 20 65 72 72 6f 72 20 6c 6f 67 20 66 6f 72 20 64 65 74 61 <69> 6c 73 2c 20 66 69 78 20 65 72 72 6f 72 73 20 61 6e 64 20 72 65 RSP: 002b:00007ffd69dd18c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000400000000200 R11: 0000000000000246 R12: 0000000000401fe0 R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor794:9645 can't die for more than 149 seconds. syz-executor794 D26712 9645 9638 0x00004006 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4070 schedule+0xdc/0x2b0 kernel/sched/core.c:4144 io_schedule+0x1c/0x70 kernel/sched/core.c:5788 rq_qos_wait+0x301/0x3f0 block/blk-rq-qos.c:288 __wbt_wait block/blk-wbt.c:526 [inline] wbt_wait+0x20b/0x370 block/blk-wbt.c:591 __rq_qos_throttle+0x56/0xa0 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_make_request+0x3d0/0x2280 block/blk-mq.c:1938 generic_make_request block/blk-core.c:1099 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1041 submit_bio+0x113/0x600 block/blk-core.c:1225 blk_next_bio+0x4a/0x60 block/blk-lib.c:19 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:284 blkdev_issue_zeroout+0x434/0x4c0 block/blk-lib.c:378 blkdev_fallocate+0x2fc/0x410 fs/block_dev.c:2092 vfs_fallocate+0x4aa/0xa50 fs/open.c:309 ksys_fallocate+0x58/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:338 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441269 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd69dd18c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000400000000200 R11: 0000000000000246 R12: 0000000000401fe0 R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1079: #0: ffffffff88fab880 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5336 1 lock held by rsyslogd/9517: #0: ffff8880a228b0e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/9607: #0: ffff88809403d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9608: #0: ffff88808efed090 (&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/9609: #0: ffff88808ec0b090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f3d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9610: #0: ffff8880a8f2d090 (&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/9611: #0: ffff88809592c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9612: #0: ffff888096c70090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9613: #0: ffff88809ae3b090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f112e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1079 Comm: khungtaskd Not tainted 5.4.0-rc6-next-20191108 #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+0x197/0x210 lib/dump_stack.c:118 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 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.331 msecs NMI backtrace for cpu 0 CPU: 0 PID: 9644 Comm: syz-executor794 Not tainted 5.4.0-rc6-next-20191108 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:lock_release+0x4a3/0x960 kernel/locking/lockdep.c:4508 Code: 85 9c 03 00 00 48 c7 c0 60 20 f3 88 48 ba 00 00 00 00 00 fc ff df 41 c7 84 24 9c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 <0f> 85 8c 03 00 00 48 83 3d 9f 91 99 07 00 0f 84 7f 01 00 00 48 8b RSP: 0018:ffff8880a2c97060 EFLAGS: 00000046 RAX: 1ffffffff11e640c RBX: 1ffff11014592e11 RCX: 1ffff110140a95d2 RDX: dffffc0000000000 RSI: 1ffff110140a95d9 RDI: ffff8880a054ae9c RBP: ffff8880a2c97130 R08: 0000000000000002 R09: ffff8880a054ae98 R10: fffffbfff1390258 R11: ffffffff89c812c7 R12: ffff8880a054a600 R13: ffffffff83357c44 R14: ffff8880a2c97108 R15: ffff8880a054a600 FS: 0000000001050880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000096e1d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:82 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get kernel/time/timekeeping.c:757 [inline] ktime_get+0xe2/0x2f0 kernel/time/timekeeping.c:747 ktime_get_ns include/linux/timekeeping.h:154 [inline] blk_mq_start_request+0x434/0x7a0 block/blk-mq.c:657 null_queue_rq+0x209/0x4f0 drivers/block/null_blk_main.c:1390 blk_mq_dispatch_rq_list+0x9f8/0x19e0 block/blk-mq.c:1244 blk_mq_do_dispatch_sched+0x1a3/0x430 block/blk-mq-sched.c:115 blk_mq_sched_dispatch_requests+0x3f4/0x6d0 block/blk-mq-sched.c:211 __blk_mq_run_hw_queue+0x1cc/0x2e0 block/blk-mq.c:1374 __blk_mq_delay_run_hw_queue+0x53e/0x600 block/blk-mq.c:1442 blk_mq_run_hw_queue+0x191/0x340 block/blk-mq.c:1479 blk_mq_sched_insert_requests+0x303/0x680 block/blk-mq-sched.c:444 blk_mq_flush_plug_list+0x87a/0xd90 block/blk-mq.c:1739 blk_flush_plug_list+0x349/0x520 block/blk-core.c:1801 blk_mq_make_request+0xaa8/0x2280 block/blk-mq.c:1981 generic_make_request block/blk-core.c:1099 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1041 submit_bio+0x113/0x600 block/blk-core.c:1225 blk_next_bio+0x4a/0x60 block/blk-lib.c:19 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:284 blkdev_issue_zeroout+0x434/0x4c0 block/blk-lib.c:378 blkdev_fallocate+0x2fc/0x410 fs/block_dev.c:2092 vfs_fallocate+0x4aa/0xa50 fs/open.c:309 ksys_fallocate+0x58/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:338 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441269 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd69dd18c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000400000000200 R11: 0000000000000246 R12: 0000000000401fe0 R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000