INFO: task syz-executor350:8656 can't die for more than 143 seconds. syz-executor350 R running task 27256 8656 8654 0x00004006 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 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:1943 generic_make_request block/blk-core.c:1093 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1035 submit_bio+0x113/0x600 block/blk-core.c:1219 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:2089 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:00007ffc6d0e55e8 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-executor350:8661 can't die for more than 144 seconds. syz-executor350 R running task 27256 8661 8660 0x00004006 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 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:1943 generic_make_request block/blk-core.c:1093 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1035 submit_bio+0x113/0x600 block/blk-core.c:1219 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:2089 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:00007ffc6d0e55e8 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-executor350:8662 can't die for more than 144 seconds. syz-executor350 R running task 27256 8662 8658 0x00004006 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4069 INFO: task syz-executor350:8663 can't die for more than 145 seconds. syz-executor350 D27256 8663 8655 0x00004006 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 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:1943 generic_make_request block/blk-core.c:1093 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1035 submit_bio+0x113/0x600 block/blk-core.c:1219 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:2089 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:00007ffc6d0e55e8 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-executor350:8664 can't die for more than 146 seconds. syz-executor350 R running task 27336 8664 8659 0x00004006 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+0xc/0x70 kernel/sched/core.c:5779 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:1943 generic_make_request block/blk-core.c:1093 [inline] generic_make_request+0x23c/0xb50 block/blk-core.c:1035 submit_bio+0x113/0x600 block/blk-core.c:1219 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:2089 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:00007ffc6d0e55e8 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-executor350:8665 can't die for more than 147 seconds. syz-executor350 D27256 8665 8657 0x00004006 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x94a/0x1e70 kernel/sched/core.c:4069 Showing all locks held in the system: 1 lock held by khungtaskd/1073: #0: ffffffff88fab740 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5336 1 lock held by rsyslogd/8538: #0: ffff888098390620 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8628: #0: ffff8880a1d05090 (&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/8629: #0: ffff8880a9790090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f4b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8630: #0: ffff8880a47ae090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f3f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8631: #0: ffff88809fc6a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f472e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8632: #0: ffff8880946cf090 (&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/8633: #0: ffff888092b6e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f432e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8634: #0: ffff88809a971090 (&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 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1073 Comm: khungtaskd Not tainted 5.4.0-rc3-next-20191018 #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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3-next-20191018 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:95 Code: 89 25 c4 94 3d 09 41 bc f4 ff ff ff e8 1d 8c e9 ff 48 c7 05 ae 94 3d 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 48 8b 04 25 80 fe 01 00 65 8b 15 74 b0 8e 7e 81 e2 RSP: 0018:ffff8880a989f9f0 EFLAGS: 00000092 RAX: 0000000000000286 RBX: ffff88809962f0c0 RCX: ffffffff81915655 RDX: 0000000000000100 RSI: ffff88809962f0c0 RDI: ffff88821acc9540 RBP: ffff8880a989fa28 R08: ffff8880a9886240 R09: ffff8880a9886ad8 R10: fffffbfff138fe50 R11: ffffffff89c7f287 R12: ffff88821acc9540 R13: ffff88809962f0c0 R14: 0000000000000286 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000008fe26000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kmem_cache_free+0x5b/0x320 mm/slab.c:3690 mempool_free_slab+0x1e/0x30 mm/mempool.c:520 mempool_free+0xeb/0x370 mm/mempool.c:502 bio_free+0x268/0x420 block/bio.c:255 bio_put+0xda/0x110 block/bio.c:549 __bio_chain_endio block/bio.c:307 [inline] bio_endio+0x2c2/0xaf0 block/bio.c:1804 req_bio_endio block/blk-core.c:271 [inline] blk_update_request+0x49e/0x10d0 block/blk-core.c:1491 blk_mq_end_request+0x5b/0x560 block/blk-mq.c:552 end_cmd drivers/block/null_blk_main.c:648 [inline] end_cmd+0x111/0x310 drivers/block/null_blk_main.c:642 null_complete_rq+0x19/0x20 drivers/block/null_blk_main.c:675 blk_done_softirq+0x2fe/0x4d0 block/blk-softirq.c:37 __do_softirq+0x262/0x98c kernel/softirq.c:292 run_ksoftirqd kernel/softirq.c:603 [inline] run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595 smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352