INFO: task syz-executor.1:13231 can't die for more than 143 seconds. syz-executor.1 R running task 26992 13231 7225 0x00004006 Call Trace: INFO: task syz-executor.1:13262 can't die for more than 144 seconds. syz-executor.1 R running task 26904 13262 7225 0x00004006 Call Trace: preempt_schedule_common+0x4a/0xc0 kernel/sched/core.c:4244 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:50 __blk_mq_delay_run_hw_queue+0x54e/0x5e0 block/blk-mq.c:1467 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1519 blk_mq_sched_insert_requests+0x2d4/0x5f0 block/blk-mq-sched.c:474 blk_mq_flush_plug_list+0x452/0x880 block/blk-mq.c:1769 blk_flush_plug_list+0x2ff/0x460 block/blk-core.c:1760 blk_mq_make_request+0xa5b/0x20f0 block/blk-mq.c:2041 generic_make_request block/blk-core.c:1075 [inline] generic_make_request+0x23c/0xb00 block/blk-core.c:1017 submit_bio+0x104/0x580 block/blk-core.c:1200 blk_next_bio+0x45/0x60 block/blk-lib.c:19 __blkdev_issue_zero_pages+0x158/0x450 block/blk-lib.c:284 blkdev_issue_zeroout+0x433/0x4d0 block/blk-lib.c:378 blkdev_fallocate+0x2e8/0x3f0 fs/block_dev.c:2132 vfs_fallocate+0x48a/0xa10 fs/open.c:309 ksys_fallocate+0x51/0x90 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x93/0xf0 fs/open.c:338 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fabfdca4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00000000004db9c0 RCX: 000000000045ca29 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000007 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 000040007fffffff R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000000ae R14: 00000000004c35e0 R15: 00007fabfdca56d4 Showing all locks held in the system: 2 locks held by kworker/u4:3/154: 1 lock held by khungtaskd/1146: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by systemd-journal/4137: 1 lock held by in:imklog/6986: #0: ffff888096cbc170 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 1 lock held by syz-fuzzer/7074: #0: ffff8880ae6379d8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1262 [inline] #0: ffff8880ae6379d8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x233/0x1ff0 kernel/sched/core.c:4034 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1146 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-syzkaller #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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 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: 154 Comm: kworker/u4:3 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_purge_orig RIP: 0010:check_memory_region+0x16/0x190 mm/kasan/generic.c:192 Code: 01 0f 1f 00 48 89 f2 be f8 00 00 00 e9 13 af ff 01 0f 1f 00 48 85 f6 0f 84 40 01 00 00 49 89 fa 41 54 0f b6 d2 49 01 f2 55 53 <0f> 82 20 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 0d RSP: 0018:ffffc90000fb7bb8 EFLAGS: 00000282 RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff815a83a0 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888050002f00 RBP: ffff888050002f00 R08: 0000000000000004 R09: fffffbfff15169c1 R10: ffff888050002f04 R11: fffffbfff15169c0 R12: ffff8880507ecd48 R13: ffff8880507ecd58 R14: dffffc0000000000 R15: 00000000000000bc FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fa54be008 CR3: 00000000a9192000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: instrument_atomic_read include/linux/instrumented.h:56 [inline] atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] queued_spin_is_locked include/asm-generic/qspinlock.h:26 [inline] debug_spin_unlock kernel/locking/spinlock_debug.c:98 [inline] do_raw_spin_unlock+0x50/0x260 kernel/locking/spinlock_debug.c:138 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:175 [inline] _raw_spin_unlock_bh+0x1a/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:398 [inline] batadv_purge_orig_ref+0xbf9/0x1270 net/batman-adv/originator.c:1366 batadv_purge_orig+0x17/0x60 net/batman-adv/originator.c:1379 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352