INFO: task hung in rdma_destroy_id

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 31acccdc Linux 4.19.157
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=101d8af6500000
kernel config: https://syzkaller.appspot.com/x/.config?x=1f604e014c43fe09
dashboard link: https://syzkaller.appspot.com/bug?extid=fa44367615d6e8d12311
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fa4436...@syzkaller.appspotmail.com

romfs: bad initial checksum on dev loop4.
romfs: bad initial checksum on dev loop4.
isofs_fill_super: root inode is not a directory. Corrupted media?
INFO: task syz-executor.0:2547 blocked for more than 140 seconds.
Not tainted 4.19.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28648 2547 8118 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1801
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common+0x29c/0x470 kernel/sched/completion.c:115
rdma_destroy_id+0x4c9/0x950 drivers/infiniband/core/cma.c:1750
ucma_close+0x140/0x360 drivers/infiniband/core/ucma.c:1819
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x417811
Code: 14 24 e8 82 35 ff ff 48 8b 44 24 48 48 89 04 24 e8 54 04 00 00 48 8b 44 24 08 48 85 c0 74 4c 48 89 44 24 28 48 8b 44 24 48 48 <89> 04 24 e8 b7 33 ff ff 48 8b 44 24 48 48 8d 48 20 48 89 0c 24 48
RSP: 002b:00007ffc34808700 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000417811
RDX: 0000001b2f120000 RSI: 00000000000009e5 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000005e14e9e5 R09: 000000005e14e9e9
R10: 00007ffc348087e0 R11: 0000000000000293 R12: ffffffffffffffff
R13: 0000000000259fd2 R14: 00000000000003e8 R15: 000000000118bf2c

Showing all locks held in the system:
1 lock held by khungtaskd/1565:
#0: 00000000c9d771cf (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/7811:
#0: 0000000093493dbb (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767

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

NMI backtrace for cpu 1
CPU: 1 PID: 1565 Comm: khungtaskd Not tainted 4.19.157-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+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 kernel/hung_task.c:287
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4681 Comm: systemd-journal Not tainted 4.19.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:46 [inline]
RIP: 0010:unwind_get_return_address+0xe/0x90 arch/x86/kernel/unwind_orc.c:294
Code: ff ff ff e8 44 9d 70 00 eb b4 e8 3d 9d 70 00 eb 80 90 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 <48> c1 ea 03 53 48 89 fb 0f b6 04 02 84 c0 74 04 3c 03 7e 51 8b 03
RSP: 0018:ffff8880a1037ab8 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: ffffffff8820008d RCX: 0000000000000000
RDX: ffff8880a1037ad8 RSI: ffff8880a1037f58 RDI: ffff8880a1037ad8
RBP: ffff8880a1037b58 R08: ffffffff8c11245c R09: ffffffff8c11245d
R10: 0000000000074071 R11: 0000000000000001 R12: ffff8880a1037b70
R13: 0000000000000000 R14: ffff88813be83e40 R15: 0000000000001000
FS: 00007f1c1b49b8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c18420000 CR3: 00000000a1112000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
__save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45
save_stack mm/kasan/kasan.c:448 [inline]
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553
slab_post_alloc_hook mm/slab.h:445 [inline]
slab_alloc mm/slab.c:3397 [inline]
kmem_cache_alloc+0x110/0x370 mm/slab.c:3557
getname_flags+0xce/0x590 fs/namei.c:140
user_path_at_empty+0x2a/0x50 fs/namei.c:2609
user_path_at include/linux/namei.h:57 [inline]
do_faccessat+0x248/0x7a0 fs/open.c:397
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f1c1a7579c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd65e07ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffd65e0aa00 RCX: 00007f1c1a7579c7
RDX: 00007f1c1b1c8a00 RSI: 0000000000000000 RDI: 0000563eaf4e09a3
RBP: 00007ffd65e07b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffd65e0aa00 R15: 00007ffd65e08010


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 31acccdc Linux 4.19.157
git tree: linux-4.19.y

console output: https://syzkaller.appspot.com/x/log.txt?x=1248447a500000

kernel config: https://syzkaller.appspot.com/x/.config?x=1f604e014c43fe09
dashboard link: https://syzkaller.appspot.com/bug?extid=fa44367615d6e8d12311
compiler: gcc (GCC) 10.1.0-syz 20200507

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c2fd9a500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16604dba500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fa4436...@syzkaller.appspotmail.com

INFO: task syz-executor444:23528 blocked for more than 140 seconds.

Not tainted 4.19.157-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

syz-executor444 D28368 23528 8128 0x00000004

Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1801
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common+0x29c/0x470 kernel/sched/completion.c:115
rdma_destroy_id+0x4c9/0x950 drivers/infiniband/core/cma.c:1750
ucma_close+0x140/0x360 drivers/infiniband/core/ucma.c:1819
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe

RIP: 0033:0x401b50
Code: 01 f0 ff ff 0f 83 40 0d 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 9b 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 14 0d 00 00 c3 48 83 ec 08 e8 7a 02 00 00
RSP: 002b:00007ffdd784f318 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000401b50
RDX: 0000000000000048 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000bb1414ac R09: 00000000bb1414ac
R10: 00000000bb1414ac R11: 0000000000000246 R12: 00000000000b5422
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:

1 lock held by khungtaskd/1566:
#0: 00000000170bded2 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/7836:
#0: 000000001f329f29 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
3 locks held by syz-executor444/8135:
#0: 00000000be972154 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000be972154 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
#1: 00000000170bded2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline]
#1: 00000000170bded2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857
#2: 00000000128d0a77 (pool_lock){-.-.}, at: __free_object+0x17/0x1e0 lib/debugobjects.c:251
1 lock held by syz-executor444/31283:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
5 locks held by syz-executor444/31286:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
#1: 00000000170bded2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline]
#1: 00000000170bded2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857
#2: 00000000170bded2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline]
#2: 00000000170bded2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857
#3: 00000000170bded2 (rcu_read_lock){....}, at: lock_page_memcg+0x0/0x220 include/linux/page_counter.h:64
#4: 00000000170bded2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline]
#4: 00000000170bded2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857
1 lock held by syz-executor444/31327:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9701 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6840
1 lock held by syz-executor444/31330:
#0: 000000005a8efe0b (misc_mtx){+.+.}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor444/31340:
#0: 000000005a8efe0b (misc_mtx){+.+.}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor444/31342:
1 lock held by syz-executor444/31346:
1 lock held by syz-executor444/31352:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31360:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31373:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31378:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31386:
#0: 000000005a8efe0b (misc_mtx){+.+.}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
2 locks held by syz-executor444/31390:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
#1: 00000000170bded2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline]
#1: 00000000170bded2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857
1 lock held by syz-executor444/31406:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31414:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31429:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31434:
#0: 00000000be972154 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000be972154 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31438:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31445:
#0: 00000000be972154 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000be972154 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31450:
1 lock held by syz-executor444/31454:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31461:
1 lock held by syz-executor444/31462:
#0: 000000005a8efe0b (misc_mtx){+.+.}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor444/31471:
#0: 00000000be972154 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000be972154 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31490:
#0: 000000005a8efe0b (misc_mtx){+.+.}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor444/31504:
#0: 00000000be972154 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000be972154 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by syz-executor444/31510:
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000df536fb9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
3 locks held by syz-executor444/31514:
#0: 00000000be972154 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1830 [inline]
#0: 00000000be972154 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
#1: 00000000170bded2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline]
#1: 00000000170bded2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857
#2: 00000000117ff563 (&sig->wait_chldexit){....}, at: __wake_up_common_lock+0xb0/0x170 kernel/sched/wait.c:120

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

NMI backtrace for cpu 1

CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.157-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+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 kernel/hung_task.c:287
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0

CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 4.19.157-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

RIP: 0010:unwind_next_frame+0x450/0x1c60 arch/x86/kernel/unwind_orc.c:427
Code: b8 00 00 00 00 00 fc ff df 4c 89 c2 48 c1 ea 03 0f b6 04 02 4c 89 c2 83 e2 07 38 d0 7f 08 84 c0 0f 85 80 10 00 00 0f b6 41 04 <a8> 0f 0f 85 a9 00 00 00 48 8d 79 05 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffff8880b5a6f850 EFLAGS: 00000046
RAX: 0000000000000015 RBX: 1ffff11016b4df12 RCX: ffffffff8b99b8ea
RDX: 0000000000000006 RSI: ffffffff8b99b8ea RDI: ffffffff8b38eee0
RBP: 0000000000000001 R08: ffffffff8b99b8ee R09: ffffffff8b99b8ea
R10: 0000000000074071 R11: 0000000000023617 R12: ffff8880b5a6f980
R13: ffff8880b5a6f96d R14: ffff8880b5a6f970 R15: ffff8880b5a6f938
FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000006d3090 CR3: 000000009c816000 CR4: 00000000001406f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__save_stack_trace+0xd6/0x190 arch/x86/kernel/stacktrace.c:44

save_stack mm/kasan/kasan.c:448 [inline]
set_track mm/kasan/kasan.c:460 [inline]

__kasan_slab_free+0x126/0x1f0 mm/kasan/kasan.c:521
__cache_free mm/slab.c:3503 [inline]
kfree+0xcc/0x210 mm/slab.c:3822
aa_free_task_ctx security/apparmor/include/task.h:61 [inline]
apparmor_task_free+0x143/0x1e0 security/apparmor/lsm.c:93
security_task_free+0x3e/0x70 security/security.c:992
__put_task_struct+0xea/0x340 kernel/fork.c:688
put_task_struct include/linux/sched/task.h:98 [inline]
delayed_put_task_struct+0x1dc/0x320 kernel/exit.c:181
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
__do_softirq+0x26c/0x9a0 kernel/softirq.c:292
run_ksoftirqd+0x57/0x110 kernel/softirq.c:653
smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:164

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 01413361185139f3c7b37f5bd92d1badfb46930d
Author: Thinh Nguyen <Thinh....@synopsys.com>
Date: Tue Jan 5 04:07:15 2021 +0000

usb: uas: Add PNY USB Portable SSD to unusual_uas

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=125b66b8d00000
start commit: 31acccdc Linux 4.19.157
git tree: linux-4.19.y

kernel config: https://syzkaller.appspot.com/x/.config?x=1f604e014c43fe09
dashboard link: https://syzkaller.appspot.com/bug?extid=fa44367615d6e8d12311

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c2fd9a500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16604dba500000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: usb: uas: Add PNY USB Portable SSD to unusual_uas

For information about bisection process see: https://goo.gl/tpsmEJ#bisection