Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. syzkaller login: [ 453.453355][ T6838] block nbd0: shutting down sockets [ 483.788085][ T2454] block nbd0: Possible stuck request 00000000b36b53f0: control (read@0,4096B). Runtime 30 seconds [ 513.868078][ T2454] block nbd0: Possible stuck request 00000000b36b53f0: control (read@0,4096B). Runtime 60 seconds [ 543.948087][ T2454] block nbd0: Possible stuck request 00000000b36b53f0: control (read@0,4096B). Runtime 90 seconds [ 574.028070][ T2454] block nbd0: Possible stuck request 00000000b36b53f0: control (read@0,4096B). Runtime 120 seconds [ 604.108114][ T2454] block nbd0: Possible stuck request 00000000b36b53f0: control (read@0,4096B). Runtime 150 seconds [ 616.268128][ T1171] INFO: task syz-executor022:6847 blocked for more than 143 seconds. [ 616.276273][ T1171] Not tainted 5.9.0-rc3-syzkaller #0 [ 616.283215][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.292176][ T1171] task:syz-executor022 state:D stack:27968 pid: 6847 ppid: 6836 flags:0x00004004 [ 616.301468][ T1171] Call Trace: [ 616.304846][ T1171] __schedule+0x9b9/0xd20 [ 616.309253][ T1171] ? schedule+0x188/0x220 [ 616.313580][ T1171] ? io_schedule+0x86/0xf0 [ 616.318169][ T1171] ? wait_on_page_bit_common+0xa8c/0xd40 [ 616.323825][ T1171] ? trace_mm_filemap_add_to_page_cache+0x270/0x270 [ 616.330462][ T1171] ? do_read_cache_page+0x2e0/0xd00 [ 616.335757][ T1171] ? read_part_sector+0xd8/0x2d0 [ 616.340849][ T1171] ? vsnprintf+0x1a12/0x1aa0 [ 616.345462][ T1171] ? adfspart_check_ICS+0x45/0x640 [ 616.350646][ T1171] ? snprintf+0x6f/0x90 [ 616.355068][ T1171] ? disk_name+0x1c/0xe0 [ 616.359390][ T1171] ? vsnprintf+0x1a08/0x1aa0 [ 616.364075][ T1171] ? vsnprintf+0x142/0x1aa0 [ 616.368642][ T1171] ? blk_add_partitions+0x3ce/0x1240 [ 616.374004][ T1171] ? bdev_disk_changed+0x400/0x540 [ 616.379204][ T1171] ? __blkdev_get+0x5f1/0x1700 [ 616.383973][ T1171] ? blkdev_open+0x1c5/0x2e0 [ 616.388626][ T1171] ? block_ioctl+0x100/0x100 [ 616.393298][ T1171] ? do_dentry_open+0x7c8/0x1010 [ 616.398365][ T1171] ? path_openat+0x2794/0x3840 [ 616.403184][ T1171] ? lock_is_held_type+0xb3/0xe0 [ 616.408202][ T1171] ? lock_is_held_type+0xb3/0xe0 [ 616.413137][ T1171] ? do_filp_open+0x191/0x3a0 [ 616.417829][ T1171] ? _raw_spin_unlock+0x24/0x40 [ 616.422814][ T1171] ? __alloc_fd+0x55c/0x600 [ 616.427322][ T1171] ? do_sys_openat2+0x463/0x830 [ 616.432619][ T1171] ? __x64_sys_open+0x1af/0x1e0 [ 616.437508][ T1171] ? do_syscall_64+0x31/0x70 [ 616.442183][ T1171] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.448339][ T1171] [ 616.448339][ T1171] Showing all locks held in the system: [ 616.456065][ T1171] 1 lock held by khungtaskd/1171: [ 616.461162][ T1171] #0: ffffffff894fe510 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 616.470644][ T1171] 1 lock held by syz-executor022/6847: [ 616.476091][ T1171] #0: ffff88808af4e980 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x2dd/0x1700 [ 616.485627][ T1171] [ 616.488015][ T1171] ============================================= [ 616.488015][ T1171] [ 616.496416][ T1171] NMI backtrace for cpu 1 [ 616.500849][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-syzkaller #0 [ 616.509086][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.519141][ T1171] Call Trace: [ 616.522490][ T1171] dump_stack+0x1d6/0x29e [ 616.526812][ T1171] nmi_cpu_backtrace+0x9f/0x180 [ 616.531707][ T1171] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 616.537764][ T1171] nmi_trigger_cpumask_backtrace+0x16a/0x280 [ 616.543792][ T1171] watchdog+0xd65/0xdb0 [ 616.548047][ T1171] kthread+0x37e/0x3a0 [ 616.552107][ T1171] ? hungtask_pm_notify+0x50/0x50 [ 616.557119][ T1171] ? kthread_blkcg+0xd0/0xd0 [ 616.561775][ T1171] ret_from_fork+0x1f/0x30 [ 616.566328][ T1171] Sending NMI from CPU 1 to CPUs 0: [ 616.572003][ C0] NMI backtrace for cpu 0 [ 616.572007][ C0] CPU: 0 PID: 3893 Comm: systemd-journal Not tainted 5.9.0-rc3-syzkaller #0 [ 616.572012][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.572015][ C0] RIP: 0010:shmem_getpage_gfp+0x1786/0x2c50 [ 616.572022][ C0] Code: 00 e8 be a2 16 00 4c 8b a4 24 10 01 00 00 49 8d 7c 24 08 48 89 f8 48 c1 e8 03 80 3c 28 00 74 05 e8 9f a2 16 00 49 8b 5c 24 08 <48> 89 de 48 83 e6 01 31 ff e8 1c cf d6 ff 48 89 d8 48 83 e0 01 0f [ 616.572025][ C0] RSP: 0000:ffffc90001647a90 EFLAGS: 00000246 [ 616.572031][ C0] RAX: 1ffffd40004965c9 RBX: ffffea00024b2e08 RCX: ffffffff819e3136 [ 616.572035][ C0] RDX: ffff8880935f4140 RSI: 0000000000000000 RDI: ffffea00024b2e48 [ 616.572039][ C0] RBP: dffffc0000000000 R08: ffffffff819e315c R09: fffff940004965c9 [ 616.572043][ C0] R10: fffff940004965c9 R11: 0000000000000000 R12: ffffea00024b2e40 [ 616.572046][ C0] R13: ffff8880933c58b0 R14: ffff8880933c5888 R15: ffff8880937d5840 [ 616.572050][ C0] FS: 00007fb7548c48c0(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 616.572053][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.572057][ C0] CR2: 00007fb751c65000 CR3: 00000000937bd000 CR4: 00000000001506f0 [ 616.572060][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.572064][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.572066][ C0] Call Trace: [ 616.572069][ C0] shmem_fault+0x24b/0x760 [ 616.572071][ C0] ? lock_is_held_type+0xb3/0xe0 [ 616.572074][ C0] ? rcu_read_lock_sched_held+0x2f/0xa0 [ 616.572077][ C0] ? trace_lock_release+0x149/0x1a0 [ 616.572080][ C0] ? rcu_lock_release+0x5/0x20 [ 616.572082][ C0] __do_fault+0x138/0x3b0 [ 616.572085][ C0] do_shared_fault+0x3f/0x740 [ 616.572098][ C0] ? handle_mm_fault+0x237a/0x29a0 [ 616.572100][ C0] handle_mm_fault+0x2387/0x29a0 [ 616.572103][ C0] do_user_addr_fault+0x515/0xa90 [ 616.572106][ C0] exc_page_fault+0x129/0x240 [ 616.572108][ C0] ? asm_exc_page_fault+0x8/0x30 [ 616.572111][ C0] asm_exc_page_fault+0x1e/0x30 [ 616.572113][ C0] RIP: 0033:0x7fb753bce041 [ 616.572120][ C0] Code: 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 c5 fe 7f 07 fe 7f 4c 17 e0 c5 f8 77 c3 48 3b 15 36 54 27 00 0f 83 25 01 00 [ 616.572123][ C0] RSP: 002b:00007ffdd6c008c8 EFLAGS: 00010287 [ 616.572129][ C0] RAX: 00007fb751c64fe0 RBX: 000055a19c7d7730 RCX: 0000000000220fa0 [ 616.572132][ C0] RDX: 0000000000000027 RSI: 000055a19c7d7730 RDI: 00007fb751c64fe0 [ 616.572136][ C0] RBP: 0000000000000027 R08: 0000000000221007 R09: 000055a19c7ce120 [ 616.572139][ C0] R10: 00007ffdd6c00a70 R11: 00000000000121a2 R12: 000055a19c7cde80 [ 616.572143][ C0] R13: 0000000000000000 R14: 00007ffdd6c00a78 R15: 00007fb751c64fa0 [ 616.572698][ T1171] Kernel panic - not syncing: hung_task: blocked tasks [ 616.849349][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-syzkaller #0 [ 616.857688][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.867838][ T1171] Call Trace: [ 616.871139][ T1171] dump_stack+0x1d6/0x29e [ 616.875525][ T1171] panic+0x2c0/0x800 [ 616.879405][ T1171] ? nmi_trigger_cpumask_backtrace+0x206/0x280 [ 616.885549][ T1171] watchdog+0xda5/0xdb0 [ 616.889702][ T1171] kthread+0x37e/0x3a0 [ 616.894703][ T1171] ? hungtask_pm_notify+0x50/0x50 [ 616.899810][ T1171] ? kthread_blkcg+0xd0/0xd0 [ 616.904387][ T1171] ret_from_fork+0x1f/0x30 [ 616.910300][ T1171] Kernel Offset: disabled [ 616.914664][ T1171] Rebooting in 86400 seconds..