block nbd0: shutting down sockets INFO: task syz-executor122:8080 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor122 D28088 8080 8079 0x80000006 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_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 blkdev_put+0x30/0x520 fs/block_dev.c:1839 blkdev_close+0x86/0xb0 fs/block_dev.c:1888 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff0365286f9 Code: Bad RIP value. RSP: 002b:00007ffd1f8c1b08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007ff0365286f9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 0000000000000000 R08: 00007ffd1f8c1ca8 R09: 00007ffd1f8c1ca8 R10: 000000000000ffff R11: 0000000000000246 R12: 00007ff0364e7780 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 INFO: task systemd-udevd:8084 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26624 8084 4696 0x00000104 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 io_schedule+0xb5/0x120 kernel/sched/core.c:5181 wait_on_page_bit_common mm/filemap.c:1123 [inline] wait_on_page_bit+0x2c5/0x3f0 mm/filemap.c:1156 wait_on_page_locked include/linux/pagemap.h:531 [inline] wait_on_page_read mm/filemap.c:2795 [inline] do_read_cache_page+0x8ed/0x1170 mm/filemap.c:2834 read_mapping_page include/linux/pagemap.h:402 [inline] read_dev_sector+0xbf/0x500 block/partition-generic.c:671 read_part_sector block/partitions/check.h:38 [inline] adfspart_check_ICS+0x114/0xe70 block/partitions/acorn.c:366 check_partition+0x390/0x690 block/partitions/check.c:167 rescan_partitions+0x1b5/0x970 block/partition-generic.c:535 bdev_disk_changed+0x179/0x1b0 fs/block_dev.c:1435 __blkdev_get+0x1282/0x1480 fs/block_dev.c:1561 blkdev_get+0xb0/0x940 fs/block_dev.c:1627 blkdev_open+0x202/0x290 fs/block_dev.c:1788 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f63c5aaf840 Code: Bad RIP value. RSP: 002b:00007ffde2119388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000563301a6f6e0 RCX: 00007f63c5aaf840 RDX: 0000563300295fe3 RSI: 00000000000a0800 RDI: 0000563301a741b0 RBP: 00007ffde2119500 R08: 0000563300295670 R09: 0000000000000010 R10: 0000563300295d0c R11: 0000000000000246 R12: 00007ffde2119450 R13: 0000563301a72880 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 0000000079e46030 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by syz-executor122/8080: #0: 000000007a124771 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1839 1 lock held by systemd-udevd/8084: #0: 000000007a124771 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4695 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x20 kernel/kcov.c:188 Code: 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 ec fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 48 8b 0c 24 89 f2 89 fe 05 00 00 00 e9 ce fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f RSP: 0018:ffff8880a08f7550 EFLAGS: 00000057 RAX: ffff8880a08ea640 RBX: 0000000000000000 RCX: ffffffff87edb130 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000008 RBP: ffff8880b59e3720 R08: 0000000000000001 R09: ffff8880a08f7640 R10: ffff8880a08f768f R11: 0000000000000001 R12: ffff8880ba11e730 R13: 00000000ffffffff R14: dffffc0000000000 R15: ffff8880b59e3720 FS: 00007fdf560148c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdf533ef000 CR3: 00000000a1007000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cpumask_next_and+0x20/0x50 lib/cpumask.c:37 update_sg_lb_stats kernel/sched/fair.c:7980 [inline] update_sd_lb_stats kernel/sched/fair.c:8162 [inline] find_busiest_group+0x383/0x25f0 kernel/sched/fair.c:8433 load_balance+0x36d/0x2080 kernel/sched/fair.c:8698 idle_balance kernel/sched/fair.c:9680 [inline] pick_next_task_fair+0x487/0x1570 kernel/sched/fair.c:6841 pick_next_task kernel/sched/core.c:3363 [inline] __schedule+0x457/0x2040 kernel/sched/core.c:3491 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_hrtimeout_range_clock+0x33e/0x390 kernel/time/hrtimer.c:2002 ep_poll+0xabb/0xcb0 fs/eventpoll.c:1817 do_epoll_wait+0x1aa/0x200 fs/eventpoll.c:2190 __do_sys_epoll_wait fs/eventpoll.c:2200 [inline] __se_sys_epoll_wait fs/eventpoll.c:2197 [inline] __x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2197 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fdf552dd2e3 Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 RSP: 002b:00007fffea2818c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055c2db54d1e0 RCX: 00007fdf552dd2e3 RDX: 0000000000000013 RSI: 00007fffea2818d0 RDI: 0000000000000008 RBP: 00007fffea281ac0 R08: 00007fffea293000 R09: 000000b8e12bdc33 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffea2818d0 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005e2e5607c64de ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 8b 0c 24 mov (%rsp),%rcx 6: 0f b7 d6 movzwl %si,%edx 9: 0f b7 f7 movzwl %di,%esi c: bf 03 00 00 00 mov $0x3,%edi 11: e9 ec fe ff ff jmpq 0xffffff02 16: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 1d: 00 00 00 00 21: 90 nop 22: 48 8b 0c 24 mov (%rsp),%rcx 26: 89 f2 mov %esi,%edx 28: 89 fe mov %edi,%esi * 2a: bf 05 00 00 00 mov $0x5,%edi <-- trapping instruction 2f: e9 ce fe ff ff jmpq 0xffffff02 34: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 3b: 00 00 00 00 3f: 0f .byte 0xf