INFO: task can't die in blkdev

INFO: task can't die in blkdev_put
Status: moderation: reported on 2020/10/13 10:52
Reported-by: syzbot+8c02745ed3190be1fe0f@syzkaller.appspotmail.com
First crash: 17d, last: 3d02h

Sample crash report:
INFO: task syz-executor.1:10390 can't die for more than 143 seconds.
task:syz-executor.1  state:D stack:27992 pid:10390 ppid:  8501 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3773 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4522
 schedule+0xcf/0x270 kernel/sched/core.c:4600
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4659
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
 blkdev_put+0x30/0x520 fs/block_dev.c:1802
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1851
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:165 [inline]
 exit_to_user_mode_prepare+0x17e/0x1a0 kernel/entry/common.c:192
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:267
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4177b1
Code: Unable to access opcode bytes at RIP 0x417787.
RSP: 002b:00007ffc05999d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004177b1
RDX: 0000000000000000 RSI: 00000000000003ea RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000030ddc3ea R09: 0000000030ddc3ee
R10: 00007ffc05999e30 R11: 0000000000000293 R12: 000000000118c9a0
R13: 000000000118c9a0 R14: 00000000000003e8 R15: 000000000118bf2c
INFO: task syz-executor.1:10390 blocked for more than 143 seconds.
      Not tainted 5.9.0-next-20201023-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:27992 pid:10390 ppid:  8501 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3773 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4522
 schedule+0xcf/0x270 kernel/sched/core.c:4600
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4659
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
 blkdev_put+0x30/0x520 fs/block_dev.c:1802
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1851
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:165 [inline]
 exit_to_user_mode_prepare+0x17e/0x1a0 kernel/entry/common.c:192
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:267
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4177b1
Code: Unable to access opcode bytes at RIP 0x417787.
RSP: 002b:00007ffc05999d50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004177b1
RDX: 0000000000000000 RSI: 00000000000003ea RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000030ddc3ea R09: 0000000030ddc3ee
R10: 00007ffc05999e30 R11: 0000000000000293 R12: 000000000118c9a0
R13: 000000000118c9a0 R14: 00000000000003e8 R15: 000000000118bf2c
INFO: task syz-executor.1:10395 can't die for more than 143 seconds.
task:syz-executor.1  state:D stack:28208 pid:10395 ppid:  8501 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3773 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4522
 schedule+0xcf/0x270 kernel/sched/core.c:4600
 io_schedule+0xb5/0x120 kernel/sched/core.c:6294
 wait_on_page_bit_common+0x32a/0xe30 mm/filemap.c:1273
 wait_on_page_bit mm/filemap.c:1334 [inline]
 wait_on_page_locked include/linux/pagemap.h:672 [inline]
 do_read_cache_page+0x257/0x1390 mm/filemap.c:3045
 read_mapping_page include/linux/pagemap.h:498 [inline]
 read_part_sector+0xf6/0x5b0 block/partitions/core.c:780
 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360
 check_partition block/partitions/core.c:140 [inline]
 blk_add_partitions+0x456/0xe40 block/partitions/core.c:708
 bdev_disk_changed+0x1ec/0x400 fs/block_dev.c:1417
 __blkdev_get+0xee4/0x1870 fs/block_dev.c:1546
 blkdev_get+0xd1/0x240 fs/block_dev.c:1634
 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1751
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3252 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3369
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 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: 0033:0x417951
Code: Unable to access opcode bytes at RIP 0x417927.
RSP: 002b:00007f9c43a0b820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000417951
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f9c43a0b850
RBP: 000000000118bf60 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000118bf2c
R13: 00007ffc05999cdf R14: 00007f9c43a0c9c0 R15: 000000000118bf2c
INFO: task syz-executor.1:10395 blocked for more than 144 seconds.
      Not tainted 5.9.0-next-20201023-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:28208 pid:10395 ppid:  8501 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3773 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4522
 schedule+0xcf/0x270 kernel/sched/core.c:4600
 io_schedule+0xb5/0x120 kernel/sched/core.c:6294
 wait_on_page_bit_common+0x32a/0xe30 mm/filemap.c:1273
 wait_on_page_bit mm/filemap.c:1334 [inline]
 wait_on_page_locked include/linux/pagemap.h:672 [inline]
 do_read_cache_page+0x257/0x1390 mm/filemap.c:3045
 read_mapping_page include/linux/pagemap.h:498 [inline]
 read_part_sector+0xf6/0x5b0 block/partitions/core.c:780
 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360
 check_partition block/partitions/core.c:140 [inline]
 blk_add_partitions+0x456/0xe40 block/partitions/core.c:708
 bdev_disk_changed+0x1ec/0x400 fs/block_dev.c:1417
 __blkdev_get+0xee4/0x1870 fs/block_dev.c:1546
 blkdev_get+0xd1/0x240 fs/block_dev.c:1634
 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1751
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3252 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3369
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 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: 0033:0x417951
Code: Unable to access opcode bytes at RIP 0x417927.
RSP: 002b:00007f9c43a0b820 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000417951
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f9c43a0b850
RBP: 000000000118bf60 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000118bf2c
R13: 00007ffc05999cdf R14: 00007f9c43a0c9c0 R15: 000000000118bf2c

Showing all locks held in the system:
2 locks held by kworker/u4:4/159:
1 lock held by khungtaskd/1655:
 #0: ffffffff8b3361a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259
1 lock held by in:imklog/8187:
 #0: ffff888013d840f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932
1 lock held by syz-executor.1/10390:
 #0: ffff88814080d500 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1802
1 lock held by syz-executor.1/10395:
 #0: ffff88814080d500 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x457/0x1870 fs/block_dev.c:1479

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

NMI backtrace for cpu 1
CPU: 1 PID: 1655 Comm: khungtaskd Not tainted 5.9.0-next-20201023-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+0x107/0x163 lib/dump_stack.c:118
 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:339
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4895 Comm: systemd-journal Not tainted 5.9.0-next-20201023-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:task_stack_page include/linux/sched/task_stack.h:21 [inline]
RIP: 0010:populate_seccomp_data kernel/seccomp.c:204 [inline]
RIP: 0010:__seccomp_filter+0x7a9/0x1510 kernel/seccomp.c:937
Code: ff ff 41 bc ff ff ff ff e9 c5 fa ff ff e8 7f 85 ff ff 65 48 8b 1c 25 00 f0 01 00 48 8d 7b 18 48 89 f8 48 c1 e8 03 80 3c 28 00 <0f> 85 26 0c 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 7b 18 4c 8d
RSP: 0018:ffffc900015ffd90 EFLAGS: 00000246
RAX: 1ffff1100237c353 RBX: ffff888011be1a80 RCX: ffffffff817007aa
RDX: ffff888011be1a80 RSI: ffffffff816fd161 RDI: ffff888011be1a98
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000027
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
FS:  00007ff9583e68c0(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff955817000 CR3: 000000001113a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __secure_computing+0xfc/0x360 kernel/seccomp.c:1074
 syscall_trace_enter.constprop.0+0x80/0x250 kernel/entry/common.c:58
 do_syscall_64+0xf/0x70 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7ff95767ff17
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 <c3> 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007ffc281651b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 000055fad06581e0 RCX: 00007ff95767ff17
RDX: 00007ffc28165270 RSI: 0000000000000000 RDI: 000055fad06581e0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000202 R12: 00007ffc28165270
R13: 000000000000131f R14: 00007ffc28168060 R15: 00007ffc28165670
Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-linux-next-kasan-gce-root	2020/10/23 10:47	linux-next	9695c4ff	4e740c00	.config	log	report			info	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci-upstream-linux-next-kasan-gce-root	2020/10/09 10:48	linux-next	e4fb79c7	92390980	.config	log	report			info	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk