INFO: task can't die in corrupted (2)

INFO: task can't die in corrupted (2)
Status: upstream: reported C repro on 2020/12/11 10:03
Reported-by: syzbot+61cb1d04bf13f0c631b1@syzkaller.appspotmail.com
First crash: 233d, last: 21d

Cause bisection: failed (bisect log)

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task can't die in corrupted	C	done		4	267d	294d	17/22	fixed on 2020/11/16 12:12

Sample crash report:

INFO: task syz-executor762:8424 can't die for more than 143 seconds.
task:syz-executor762 state:R  running task     stack:28960 pid: 8424 ppid:  8407 flags:0x00024006
Call Trace:

Showing all locks held in the system:
1 lock held by khungtaskd/1641:
 #0: ffffffff8bf75060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333
1 lock held by in:imklog/8122:
 #0: ffff88801da06af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:967

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

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 1641 Comm: khungtaskd Not tainted 5.12.0-rc5-next-20210401-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+0x141/0x1d7 lib/dump_stack.c:120
 panic+0x306/0x73d kernel/panic.c:231
 check_hung_uninterruptible_tasks kernel/hung_task.c:257 [inline]
 watchdog.cold+0x23e/0x248 kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (33):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-linux-next-kasan-gce-root	2021/04/03 21:01	linux-next	454c576c3f5e	6a81331a	.config	log	report	syz	C		INFO: task can't die in corrupted
ci-upstream-linux-next-kasan-gce-root	2021/01/31 14:13	linux-next	b01f250d83f6	fc9fd31e	.config	log	report	syz	C		INFO: task can't die in corrupted
ci-upstream-linux-next-kasan-gce-root	2021/01/31 02:03	linux-next	b01f250d83f6	fc9fd31e	.config	log	report	syz	C		INFO: task can't die in corrupted
ci-upstream-linux-next-kasan-gce-root	2021/01/28 08:54	linux-next	bc085f8fc88f	eefc07f2	.config	log	report	syz	C		INFO: task can't die in corrupted
ci-upstream-linux-next-kasan-gce-root	2021/01/16 08:41	linux-next	b3a3cbdec55b	65a7a854	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/16 03:45	linux-next	b3a3cbdec55b	65a7a854	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/15 22:49	linux-next	b3a3cbdec55b	65a7a854	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/11 18:46	linux-next	ef8b014ee4a1	2c1f2513	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/10 09:47	linux-next	1c925d2030af	2c1f2513	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/07 22:40	linux-next	2d3811a4fb23	c104d4a3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/07 18:05	linux-next	2d3811a4fb23	c104d4a3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/03 07:15	linux-next	d7a03a44a5e9	79264ae3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/03 01:51	linux-next	d7a03a44a5e9	79264ae3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/03 01:41	linux-next	d7a03a44a5e9	79264ae3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/01 10:53	linux-next	d7a03a44a5e9	79264ae3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2021/01/01 06:19	linux-next	d7a03a44a5e9	79264ae3	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/28 12:59	linux-next	d7a03a44a5e9	2242f77f	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/27 08:25	linux-next	d7a03a44a5e9	821e0b09	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/25 02:17	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/24 20:21	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/24 14:58	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/24 09:02	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/24 05:04	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/21 14:31	linux-next	4c6ed015c2a5	04201c06	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/19 08:27	linux-next	0d52778b8710	04201c06	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/19 02:36	linux-next	0d52778b8710	04201c06	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/18 21:13	linux-next	0d52778b8710	04201c06	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/18 00:32	linux-next	90cc8cf2d1ab	04201c06	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/17 05:51	linux-next	26aed0ea32c8	04201c06	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/16 02:46	linux-next	9317f948b0b1	97183ed7	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/16 02:44	linux-next	9317f948b0b1	97183ed7	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/12/07 07:26	linux-next	0eedceafd3a6	c521566d	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2021/07/07 04:25	linux-next	d72e63193059	cca78469	.config	log	report			info	INFO: task can't die in __down_common