INFO: task systemd-udevd:6864 blocked for more than 143 seconds. Not tainted 5.9.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-udevd state:D stack:26264 pid: 6864 ppid: 3926 flags:0x00004100 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 io_schedule+0xb5/0x120 kernel/sched/core.c:6296 wait_on_page_bit_common+0x32a/0xe30 mm/filemap.c:1253 wait_on_page_bit mm/filemap.c:1314 [inline] wait_on_page_locked include/linux/pagemap.h:611 [inline] wait_on_page_read mm/filemap.c:2931 [inline] do_read_cache_page+0x957/0x1390 mm/filemap.c:2974 read_mapping_page include/linux/pagemap.h:437 [inline] read_part_sector+0xf6/0x5af block/partitions/core.c:777 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:140 [inline] blk_add_partitions+0x45c/0xe40 block/partitions/core.c:705 bdev_disk_changed+0x1ea/0x370 fs/block_dev.c:1416 __blkdev_get+0xee4/0x1aa0 fs/block_dev.c:1559 blkdev_get fs/block_dev.c:1639 [inline] blkdev_open+0x227/0x300 fs/block_dev.c:1753 do_dentry_open+0x4b9/0x11b0 fs/open.c:817 do_open fs/namei.c:3251 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3368 do_filp_open+0x17e/0x3c0 fs/namei.c:3395 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f4933015840 Code: Bad RIP value. RSP: 002b:00007ffcdc613ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055bb7f5cccb0 RCX: 00007f4933015840 RDX: 000055bb7e21cfe3 RSI: 00000000000a0800 RDI: 000055bb7f5db660 RBP: 00007ffcdc613e20 R08: 000055bb7e21c670 R09: 0000000000000010 R10: 000055bb7e21cd0c R11: 0000000000000246 R12: 00007ffcdc613d70 R13: 000055bb7f5db520 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 1 lock held by khungtaskd/1175: #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5852 1 lock held by syz-executor061/6860: #0: ffff888089c2a300 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1804 1 lock held by systemd-udevd/6864: #0: ffff888089c2a300 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x4b8/0x1aa0 fs/block_dev.c:1492 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc7-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+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 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: 3916 Comm: systemd-journal Not tainted 5.9.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xd3c/0x5780 kernel/locking/lockdep.c:4311 Code: 01 00 00 00 0f 86 8e 00 00 00 89 05 be 9f 69 0b e9 83 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 <0f> 85 df 31 00 00 49 81 3e 00 a5 9a 8c 0f 84 95 f3 ff ff 41 83 fc RSP: 0018:ffffc900054d7cd8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 1ffffffff140cfe8 RSI: 0000000000000000 RDI: ffffffff8a067f40 RBP: ffff888092bee140 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8a067f40 R15: 0000000000000002 FS: 00007f2f8144b8c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2f7e7f0000 CR3: 00000000924e4000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5029 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] __task_pid_nr_ns+0x3d/0x4b0 kernel/pid.c:496 task_tgid_vnr include/linux/sched.h:1417 [inline] __do_sys_getpid+0x1a/0x20 kernel/sys.c:907 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f2f806e4f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffdf5f7a2f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 0000561cdd8161e0 RCX: 00007f2f806e4f17 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000561cdd8161e0 RBP: 0000000000000f4c R08: 0000561cdd81ff80 R09: 00007ffdf5fba080 R10: 00000000000134c2 R11: 0000000000000202 R12: ffffffffffffffff R13: 00007ffdf5f7a388 R14: 0000561cdd7ab958 R15: 0005b0630b411e98