INFO: task can't die in blkdev_get_by

INFO: task can't die in blkdev_get_by_dev
Status: moderation: reported on 2021/01/25 18:13
Reported-by: syzbot+81a03faadc8a07f9f989@syzkaller.appspotmail.com
First crash: 38d, last: 38d

Sample crash report:
INFO: task syz-executor.4:14224 can't die for more than 143 seconds.
task:syz-executor.4  state:D stack:26616 pid:14224 ppid:  8457 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 blkdev_get_by_dev fs/block_dev.c:1436 [inline]
 blkdev_get_by_dev+0x255/0x5e0 fs/block_dev.c:1405
 blkdev_open+0x154/0x2b0 fs/block_dev.c:1534
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1b8e/0x2720 fs/namei.c:3369
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 do_sys_openat2+0x16d/0x420 fs/open.c:1178
 do_sys_open fs/open.c:1194 [inline]
 __do_sys_open fs/open.c:1202 [inline]
 __se_sys_open fs/open.c:1198 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1198
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x417d11
RSP: 002b:00007f673f2c5810 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000417d11
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f673f2c5840
RBP: 000000000119bfc0 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000119bf8c
R13: 00007fff88d10f1f R14: 00007f673f2c69c0 R15: 000000000119bf8c
INFO: task syz-executor.4:14224 blocked for more than 143 seconds.
      Not tainted 5.11.0-rc4-next-20210121-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:26616 pid:14224 ppid:  8457 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 blkdev_get_by_dev fs/block_dev.c:1436 [inline]
 blkdev_get_by_dev+0x255/0x5e0 fs/block_dev.c:1405
 blkdev_open+0x154/0x2b0 fs/block_dev.c:1534
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1b8e/0x2720 fs/namei.c:3369
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 do_sys_openat2+0x16d/0x420 fs/open.c:1178
 do_sys_open fs/open.c:1194 [inline]
 __do_sys_open fs/open.c:1202 [inline]
 __se_sys_open fs/open.c:1198 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1198
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x417d11
RSP: 002b:00007f673f2c5810 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000417d11
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f673f2c5840
RBP: 000000000119bfc0 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000119bf8c
R13: 00007fff88d10f1f R14: 00007f673f2c69c0 R15: 000000000119bf8c
INFO: task syz-executor.4:14228 can't die for more than 143 seconds.
task:syz-executor.4  state:D stack:28456 pid:14228 ppid:  8457 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 blkdev_put+0x59/0x570 fs/block_dev.c:1583
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1632
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:177 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:301 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:312
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f673f2a4c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007fff88d10f1f R14: 00007f673f2a59c0 R15: 000000000119c034
INFO: task syz-executor.4:14228 blocked for more than 144 seconds.
      Not tainted 5.11.0-rc4-next-20210121-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:28456 pid:14228 ppid:  8457 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 blkdev_put+0x59/0x570 fs/block_dev.c:1583
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1632
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:177 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:301 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:312
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f673f2a4c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007fff88d10f1f R14: 00007f673f2a59c0 R15: 000000000119c034
INFO: task systemd-udevd:14288 blocked for more than 144 seconds.
      Not tainted 5.11.0-rc4-next-20210121-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-udevd   state:D stack:26432 pid:14288 ppid:  4870 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 io_schedule+0xba/0x130 kernel/sched/core.c:7012
 wait_on_page_bit_common+0x424/0xeb0 mm/filemap.c:1269
 wait_on_page_bit mm/filemap.c:1330 [inline]
 wait_on_page_locked include/linux/pagemap.h:674 [inline]
 wait_on_page_read mm/filemap.c:3179 [inline]
 do_read_cache_page+0x957/0x1390 mm/filemap.c:3222
 read_mapping_page include/linux/pagemap.h:500 [inline]
 read_part_sector+0x140/0x610 block/partitions/core.c:693
 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360
 check_partition block/partitions/core.c:148 [inline]
 blk_add_partitions+0x57c/0xf10 block/partitions/core.c:621
 bdev_disk_changed+0x1fd/0x410 fs/block_dev.c:1251
 __blkdev_get+0xa21/0xc10 fs/block_dev.c:1333
 blkdev_get_by_dev fs/block_dev.c:1437 [inline]
 blkdev_get_by_dev+0x260/0x5e0 fs/block_dev.c:1405
 blkdev_open+0x154/0x2b0 fs/block_dev.c:1534
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1b8e/0x2720 fs/namei.c:3369
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 do_sys_openat2+0x16d/0x420 fs/open.c:1178
 do_sys_open fs/open.c:1194 [inline]
 __do_sys_open fs/open.c:1202 [inline]
 __se_sys_open fs/open.c:1198 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1198
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f3e88b62840
RSP: 002b:00007ffcb349d648 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000556e29045ad0 RCX: 00007f3e88b62840
RDX: 0000556e28858fe3 RSI: 00000000000a0800 RDI: 0000556e2903e330
RBP: 00007ffcb349d7c0 R08: 0000556e28858670 R09: 0000000000000010
R10: 0000556e28858d0c R11: 0000000000000246 R12: 00007ffcb349d710
R13: 0000556e29034af0 R14: 0000000000000003 R15: 000000000000000e

Showing all locks held in the system:
1 lock held by khungtaskd/1664:
 #0: ffffffff8b370ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6326
1 lock held by in:imklog/8139:
 #0: ffff88801384ad70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947
1 lock held by syz-executor.4/14224:
 #0: ffff8881444497a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev fs/block_dev.c:1436 [inline]
 #0: ffff8881444497a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x255/0x5e0 fs/block_dev.c:1405
1 lock held by syz-executor.4/14228:
 #0: ffff8881444497a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x59/0x570 fs/block_dev.c:1583
1 lock held by systemd-udevd/14288:
 #0: ffff8881444497a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev fs/block_dev.c:1436 [inline]
 #0: ffff8881444497a0 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x255/0x5e0 fs/block_dev.c:1405

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1664 Comm: khungtaskd Not tainted 5.11.0-rc4-next-20210121-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+0x107/0x163 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:147 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
 watchdog+0xd89/0xf30 kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4869 Comm: systemd-journal Not tainted 5.11.0-rc4-next-20210121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:in_lock_functions+0x17/0x20 kernel/locking/spinlock.c:398
Code: 00 00 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 31 c0 48 81 ff 48 16 ff 88 72 0c 31 c0 48 81 ff 3c 20 ff 88 0f 92 c0 <c3> cc cc cc cc cc cc cc cc 41 57 41 56 41 55 49 c7 c5 40 5d 03 00
RSP: 0018:ffffc90000f3f5f0 EFLAGS: 00000283
RAX: 0000000000000000 RBX: ffffffff8131ea3f RCX: 1ffffffff1e1bee4
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8131ea3f
RBP: 0000000000000001 R08: ffffffff8d86d130 R09: 0000000000000001
R10: 0000000000082083 R11: 0000000000000001 R12: ffffc90000f3f730
R13: 0000000000000000 R14: ffff888011d88000 R15: ffffc90000f3f6e8
FS:  00007f806198b8c0(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f805edde000 CR3: 00000000113d0000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 get_lock_parent_ip include/linux/ftrace.h:843 [inline]
 preempt_latency_start kernel/sched/core.c:4760 [inline]
 preempt_latency_start kernel/sched/core.c:4757 [inline]
 preempt_count_add+0x74/0x140 kernel/sched/core.c:4785
 unwind_next_frame+0x11f/0x1f90 arch/x86/kernel/unwind_orc.c:428
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:403 [inline]
 ____kasan_kmalloc mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:406
 kasan_slab_alloc include/linux/kasan.h:208 [inline]
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc_node mm/slub.c:2910 [inline]
 slab_alloc mm/slub.c:2918 [inline]
 kmem_cache_alloc+0x155/0x370 mm/slub.c:2923
 kmem_cache_zalloc include/linux/slab.h:676 [inline]
 __alloc_file+0x21/0x280 fs/file_table.c:101
 alloc_empty_file+0x6d/0x170 fs/file_table.c:150
 path_openat+0xe3/0x2720 fs/namei.c:3355
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 do_sys_openat2+0x16d/0x420 fs/open.c:1178
 do_sys_open fs/open.c:1194 [inline]
 __do_sys_open fs/open.c:1202 [inline]
 __se_sys_open fs/open.c:1198 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1198
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f8060f1b840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24
RSP: 002b:00007fffb18e1278 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fffb18e1580 RCX: 00007f8060f1b840
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000557425e0f390
RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000557425e02040 R14: 00007fffb18e1540 R15: 0000557425e0f1b0
Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-linux-next-kasan-gce-root	2021/01/21 18:11	linux-next	bc085f8f	d4f4eca5	.config	log	report			info	INFO: task can't die in blkdev_get_by_dev