INFO: task syz-executor022:6847 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor022 state:D stack:27968 pid: 6847 ppid: 6836 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x9b9/0xd20 kernel/sched/core.c:4527 Showing all locks held in the system: 1 lock held by khungtaskd/1171: #0: ffffffff894fe510 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by syz-executor022/6847: #0: ffff88808af4e980 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x2dd/0x1700 fs/block_dev.c:1492 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-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+0x1d6/0x29e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd65/0xdb0 kernel/hung_task.c:295 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3893 Comm: systemd-journal Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:compound_head include/linux/page-flags.h:184 [inline] RIP: 0010:shmem_getpage_gfp+0x1786/0x2c50 mm/shmem.c:1964 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 RSP: 0000:ffffc90001647a90 EFLAGS: 00000246 RAX: 1ffffd40004965c9 RBX: ffffea00024b2e08 RCX: ffffffff819e3136 RDX: ffff8880935f4140 RSI: 0000000000000000 RDI: ffffea00024b2e48 RBP: dffffc0000000000 R08: ffffffff819e315c R09: fffff940004965c9 R10: fffff940004965c9 R11: 0000000000000000 R12: ffffea00024b2e40 R13: ffff8880933c58b0 R14: ffff8880933c5888 R15: ffff8880937d5840 FS: 00007fb7548c48c0(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb751c65000 CR3: 00000000937bd000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shmem_fault+0x24b/0x760 mm/shmem.c:2105 __do_fault+0x138/0x3b0 mm/memory.c:3463 do_shared_fault+0x3f/0x740 mm/memory.c:3910 do_fault mm/memory.c:3988 [inline] handle_pte_fault mm/memory.c:4224 [inline] __handle_mm_fault mm/memory.c:4359 [inline] handle_mm_fault+0x2387/0x29a0 mm/memory.c:4457 do_user_addr_fault+0x515/0xa90 arch/x86/mm/fault.c:1294 handle_page_fault arch/x86/mm/fault.c:1351 [inline] exc_page_fault+0x129/0x240 arch/x86/mm/fault.c:1404 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538 RIP: 0033:0x7fb753bce041 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 RSP: 002b:00007ffdd6c008c8 EFLAGS: 00010287 RAX: 00007fb751c64fe0 RBX: 000055a19c7d7730 RCX: 0000000000220fa0 RDX: 0000000000000027 RSI: 000055a19c7d7730 RDI: 00007fb751c64fe0 RBP: 0000000000000027 R08: 0000000000221007 R09: 000055a19c7ce120 R10: 00007ffdd6c00a70 R11: 00000000000121a2 R12: 000055a19c7cde80 R13: 0000000000000000 R14: 00007ffdd6c00a78 R15: 00007fb751c64fa0