NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.1:10514 blocked for more than 140 seconds. Not tainted 4.19.134-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28568 10514 6581 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1793 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 flush_workqueue+0x40b/0x13e0 kernel/workqueue.c:2715 nbd_start_device_ioctl drivers/block/nbd.c:1267 [inline] __nbd_ioctl drivers/block/nbd.c:1338 [inline] nbd_ioctl+0x759/0xbe0 drivers/block/nbd.c:1378 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x5cb/0x1a7e block/ioctl.c:601 block_ioctl+0xe9/0x130 fs/block_dev.c:1896 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c369 Code: Bad RIP value. RSP: 002b:00007fce67eb5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000011bc0 RCX: 000000000045c369 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fff57e4f31f R14: 00007fce67eb69c0 R15: 000000000078bf0c Showing all locks held in the system: 1 lock held by khungtaskd/1083: #0: 0000000083a71191 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6137: #0: 0000000020a90c8a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/u5:1/7730: #0: 0000000000a3a333 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126 #1: 0000000049af8a48 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1083 Comm: khungtaskd Not tainted 4.19.134-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3688 Comm: systemd-journal Not tainted 4.19.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:clear_page_erms+0x0/0x10 arch/x86/lib/clear_page_64.S:46 Code: 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 00 10 00 00 31 c0 f3 aa c3 90 90 90 90 90 90 41 57 41 56 41 55 RSP: 0000:ffff8880944afa40 EFLAGS: 00000286 RAX: ffff888000000000 RBX: ffffea00024d7200 RCX: 1ffff1101289468e RDX: 1ffff1101289465e RSI: ffffffff818cea25 RDI: ffff8880935c8000 RBP: ffffea00024d7200 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880944a2140 R14: ffff8880944a2140 R15: 0000000000000000 FS: 00007ff3c92e38c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff3c67ca028 CR3: 0000000094931000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: clear_page arch/x86/include/asm/page_64.h:49 [inline] clear_highpage include/linux/highmem.h:190 [inline] shmem_getpage_gfp+0x12f7/0x37f0 mm/shmem.c:1892 shmem_fault+0x206/0x6b0 mm/shmem.c:2032 __do_fault+0x10b/0x4b0 mm/memory.c:3269 do_shared_fault mm/memory.c:3736 [inline] do_fault mm/memory.c:3814 [inline] handle_pte_fault mm/memory.c:4041 [inline] __handle_mm_fault+0x25b0/0x41c0 mm/memory.c:4165 handle_mm_fault+0x436/0xb10 mm/memory.c:4202 __do_page_fault+0x6d8/0xde0 arch/x86/mm/fault.c:1412 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0033:0x7ff3c85ed03d Code: 0f 82 47 e5 fc ff 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 49 48 83 fa 40 0f 87 9f 00 00 00 c5 fe 6f 06 c5 fe 6f 4c 16 e0 fe 7f 07 c5 fe 7f 4c 17 e0 c5 f8 77 c3 48 3b 15 36 54 27 00 0f RSP: 002b:00007ffcbc8fd078 EFLAGS: 00010283 RAX: 00007ff3c67ca028 RBX: 00005614c171b290 RCX: 0000000000366fe8 RDX: 0000000000000025 RSI: 00005614c171b290 RDI: 00007ff3c67ca028 RBP: 0000000000000025 R08: 000000000036704d R09: 00005614c1713140 R10: 00007ffcbc8fd220 R11: 0000000000000001 R12: 00005614c1712ea0 R13: 0000000000000000 R14: 00007ffcbc8fd228 R15: 00007ff3c67c9fe8