INFO: task syz-executor.0:9133 blocked for more than 143 seconds. Not tainted 5.11.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28152 pid: 9133 ppid: 8403 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5213 __mutex_lock_common kernel/locking/mutex.c:1023 [inline] __mutex_lock+0x81f/0x1120 kernel/locking/mutex.c:1093 blkdev_get_by_dev fs/block_dev.c:1444 [inline] blkdev_get_by_dev+0x261/0x600 fs/block_dev.c:1413 blkdev_open+0x154/0x2b0 fs/block_dev.c:1542 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3255 [inline] path_openat+0x1b8e/0x2720 fs/namei.c:3370 do_filp_open+0x17e/0x3c0 fs/namei.c:3397 do_sys_openat2+0x16d/0x420 fs/open.c:1178 do_sys_open fs/open.c:1194 [inline] __do_sys_openat fs/open.c:1210 [inline] __se_sys_openat fs/open.c:1205 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1205 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4194e4 RSP: 002b:00007f1b8a9b6ed0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004afb60 RCX: 00000000004194e4 RDX: 0000000000000002 RSI: 00007f1b8a9b7000 RDI: 00000000ffffff9c RBP: 00007f1b8a9b7000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000003 R14: 0000000020003ab8 R15: 000000000000025d Showing all locks held in the system: 1 lock held by khungtaskd/1656: #0: ffffffff8bf743e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8079: #0: ffff88801250dc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 2 locks held by systemd-udevd/9880: #0: ffff8880234ec460 (sb_writers#3){.+.+}-{0:0}, at: do_renameat2+0x376/0xc00 fs/namei.c:4401 #1: ffff8880b9c1f948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 1 lock held by systemd-udevd/9926: 2 locks held by systemd-udevd/9947: 1 lock held by systemd-udevd/10193: 1 lock held by syz-executor.0/9133: #0: ffff888019c3a320 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev fs/block_dev.c:1444 [inline] #0: ffff888019c3a320 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x261/0x600 fs/block_dev.c:1413 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1656 Comm: khungtaskd Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9947 Comm: systemd-udevd Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xc/0x70 kernel/kcov.c:283 Code: 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 4c 8b 14 24 <89> f1 65 48 8b 34 25 00 f0 01 00 e8 54 f0 ff ff 84 c0 74 4b 48 8b RSP: 0018:ffffc900174cf8c8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc900174cf998 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff83de6bd6 R11: 0000000000000000 R12: ffff88806ce202c0 R13: ffffffffffffffff R14: 0000000000000000 R15: fffff52002e99f35 FS: 00007fa0f25058c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005598d6932c88 CR3: 0000000015581000 CR4: 0000000000350ee0 Call Trace: xa_parent include/linux/xarray.h:1197 [inline] xas_find+0x566/0x7e0 lib/xarray.c:1257 xas_next_entry include/linux/xarray.h:1641 [inline] find_get_entries+0x692/0xb80 mm/filemap.c:1913 pagevec_lookup_entries+0x35/0x80 mm/swap.c:1063 truncate_inode_pages_range+0x1f0/0x1620 mm/truncate.c:329 kill_bdev fs/block_dev.c:86 [inline] __blkdev_put+0x30b/0x800 fs/block_dev.c:1572 blkdev_put+0x92/0x580 fs/block_dev.c:1632 blkdev_close+0x8c/0xb0 fs/block_dev.c:1640 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa0f164b270 Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 RSP: 002b:00007ffdb673b268 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fa0f164b270 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fa0f2505710 R08: 00007fa0f25058c0 R09: 00005598d8dd9200 R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000000 R13: 00005598d8173110 R14: 0000000000000003 R15: 000000000000000e