INFO: task hung in blk_queue_enter

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 049053b7 ANDROID: cuttlefish_defconfig: Enable CONFIG_ARM6..
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=1093b3d5400000
kernel config: https://syzkaller.appspot.com/x/.config?x=5a6074c89b6ea274
dashboard link: https://syzkaller.appspot.com/bug?extid=2eb9e5b8684d35d87670
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2eb9e5...@syzkaller.appspotmail.com

ip6_tunnel: 6tnl0 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl2 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl3 xmit: Local address not yet configured!
ip6_tunnel: 6tnl0 xmit: Local address not yet configured!
INFO: task kworker/u4:14:16785 blocked for more than 140 seconds.
Not tainted 4.14.86+ #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:14 D26360 16785 2 0x80000000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
blk_queue_enter+0x3fc/0x510 block/blk-core.c:801
generic_make_request+0x1b3/0x870 block/blk-core.c:2222
submit_bio+0xa7/0x3a0 block/blk-core.c:2302
submit_bh_wbc.isra.17+0x45f/0x5f0 fs/buffer.c:3144
__block_write_full_page+0x4ee/0x980 fs/buffer.c:1826
block_write_full_page+0x227/0x280 fs/buffer.c:3012
__writepage+0x5f/0xc0 mm/page-writeback.c:2302
write_cache_pages+0x518/0xe90 mm/page-writeback.c:2240
generic_writepages+0xda/0x150 mm/page-writeback.c:2326
do_writepages+0xe0/0x270 mm/page-writeback.c:2341
__writeback_single_inode+0xd8/0x1020 fs/fs-writeback.c:1320
writeback_sb_inodes+0x468/0xcd0 fs/fs-writeback.c:1584
__writeback_inodes_wb+0xf8/0x1e0 fs/fs-writeback.c:1653
wb_writeback+0x4ee/0xb90 fs/fs-writeback.c:1762
wb_check_old_data_flush fs/fs-writeback.c:1875 [inline]
wb_do_writeback fs/fs-writeback.c:1899 [inline]
wb_workfn+0x85d/0xe00 fs/fs-writeback.c:1928
process_one_work+0x86e/0x1670 kernel/workqueue.c:2114
worker_thread+0xdc/0x1000 kernel/workqueue.c:2248
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
INFO: task syz-executor5:29737 blocked for more than 140 seconds.
Not tainted 4.14.86+ #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5 D27992 29737 1846 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
blk_mq_freeze_queue_wait+0xfd/0x210 block/blk-mq.c:154
loop_set_status+0x1b2/0xf40 drivers/block/loop.c:1101
loop_set_status64+0x8d/0xe0 drivers/block/loop.c:1287
lo_ioctl+0x3cd/0x17d0 drivers/block/loop.c:1400
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007f929de07c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 00000000200000c0 RSI: 0000000000004c04 RDI: 0000000000000007
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f929de086d4
R13: 00000000004c07a8 R14: 00000000004d10e8 R15: 00000000ffffffff
INFO: task syz-executor0:29738 blocked for more than 140 seconds.
Not tainted 4.14.86+ #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D25960 29738 1845 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
io_schedule+0x1c/0x70 kernel/sched/core.c:5097
wait_on_page_bit_common mm/filemap.c:1000 [inline]
wait_on_page_bit+0x22b/0x2e0 mm/filemap.c:1033
wait_on_page_writeback include/linux/pagemap.h:550 [inline]
__filemap_fdatawait_range+0x184/0x260 mm/filemap.c:434
file_write_and_wait_range+0xce/0x100 mm/filemap.c:657
blkdev_fsync+0x62/0xb0 fs/block_dev.c:636
vfs_fsync_range+0x105/0x260 fs/sync.c:196
generic_write_sync include/linux/fs.h:2693 [inline]
blkdev_write_iter+0x2e5/0x3d0 fs/block_dev.c:1908
call_write_iter include/linux/fs.h:1784 [inline]
do_iter_readv_writev+0x3a4/0x560 fs/read_write.c:678
do_iter_write+0x156/0x530 fs/read_write.c:957
vfs_iter_write+0x70/0xa0 fs/read_write.c:970
iter_file_splice_write+0x5b4/0xab0 fs/splice.c:749
do_splice_from fs/splice.c:851 [inline]
direct_splice_actor+0x116/0x160 fs/splice.c:1018
splice_direct_to_actor+0x28c/0x750 fs/splice.c:973
do_splice_direct+0x17b/0x220 fs/splice.c:1061
do_sendfile+0x4a1/0xb50 fs/read_write.c:1438
SYSC_sendfile64 fs/read_write.c:1493 [inline]
SyS_sendfile64+0xab/0x140 fs/read_write.c:1485
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007fca5ada7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569
RDX: 0000000020000240 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0020000102000007 R11: 0000000000000246 R12: 00007fca5ada86d4
R13: 00000000004c3c2a R14: 00000000004d6230 R15: 00000000ffffffff
INFO: task syz-executor0:29741 blocked for more than 140 seconds.
Not tainted 4.14.86+ #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D28056 29741 1845 0x00000004
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x57d/0x18c0 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1873
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007fca5ad65c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 000000000000000e RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fca5ad666d4
R13: 00000000004c069f R14: 00000000004d0fc8 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<ffffffff99604947>]
debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541
2 locks held by getty/1755:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff9a1407d0>]
tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff9a13bc2f>]
n_tty_read+0x1ff/0x1700 drivers/tty/n_tty.c:2156
3 locks held by kworker/u4:14/16785:
#0: ("writeback"){+.+.}, at: [<ffffffff99529534>]
process_one_work+0x784/0x1670 kernel/workqueue.c:2085
#1: ((&(&wb->dwork)->work)){+.+.}, at: [<ffffffff9952956c>]
process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089
#2: (&type->s_umount_key#23){++++}, at: [<ffffffff999660ba>]
trylock_super+0x1a/0xe0 fs/super.c:402
1 lock held by syz-executor5/29737:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff9a1efec5>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373
1 lock held by syz-executor0/29741:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff9a1efec5>]
lo_ioctl+0x85/0x17d0 drivers/block/loop.c:1373

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.86+ #18
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x11b lib/dump_stack.c:53
nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x574/0xa70 kernel/hung_task.c:252
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13980 Comm: loop0 Not tainted 4.14.86+ #18
task: ffff88819f9f9780 task.stack: ffff88819f7d8000
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:60
RSP: 0018:ffff88819f7df240 EFLAGS: 00000246
RAX: ffff88819f9f9780 RBX: 0000000000000012 RCX: 1ffff11033f3f3f5
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000246
RBP: ffff88819f7df348 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88819f9fa000 R11: 0000000000000001 R12: ffffea0005ca8680
R13: dffffc0000000000 R14: ffffea000588d940 R15: ffffea0005ca86a0
FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4339c5d70 CR3: 000000015d626001 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
__read_once_size include/linux/compiler.h:183 [inline]
compound_head include/linux/page-flags.h:147 [inline]
find_get_pages_range_tag+0x1f2/0x940 mm/filemap.c:1807
pagevec_lookup_range_tag+0x3b/0x80 mm/swap.c:993
mpage_prepare_extent_to_map+0x2f6/0xa40 fs/ext4/inode.c:2643
ext4_writepages+0x10d9/0x3040 fs/ext4/inode.c:2882
do_writepages+0xe0/0x270 mm/page-writeback.c:2341
__filemap_fdatawrite_range+0x19e/0x270 mm/filemap.c:345
filemap_write_and_wait_range+0x58/0xd0 mm/filemap.c:556
__generic_file_write_iter+0x2bc/0x540 mm/filemap.c:3148
ext4_file_write_iter+0x4f6/0xe20 fs/ext4/file.c:264
call_write_iter include/linux/fs.h:1784 [inline]
lo_rw_aio+0x97b/0x1050 drivers/block/loop.c:540
do_req_filebacked drivers/block/loop.c:582 [inline]
loop_handle_cmd drivers/block/loop.c:1737 [inline]
loop_queue_work+0x14c9/0x1e9a drivers/block/loop.c:1751
kthread_worker_fn+0x27e/0x6a0 kernel/kthread.c:642
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Code: 00 e9 9f fe ff ff 4c 89 e7 e8 14 01 22 00 e9 2c fe ff ff 90 90 90 90
90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 de 01 00 <48> 85 c0 74
1a 65 8b 15 9b f7 90 66 81 e2 00 01 1f 00 75 0b 8b


---
This bug 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 bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 2ca7ab11 BACKPORT, FROMGIT: dm verity: log the hash algori..
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=17d51035400000
kernel config: https://syzkaller.appspot.com/x/.config?x=bad90dce243c5d60
dashboard link: https://syzkaller.appspot.com/bug?extid=81adce603e41d7d3ba09

compiler: gcc (GCC) 8.0.1 20180413 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:

Reported-by: syzbot+81adce...@syzkaller.appspotmail.com

INFO: task kworker/u4:4:29348 blocked for more than 140 seconds.
Not tainted 4.9.146+ #84

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

kworker/u4:4 D25688 29348 2 0x80000000

Workqueue: writeback wb_workfn (flush-7:0)

ffff8801975a97c0 0000000000000000 ffff8801d2052680 ffffffff8302d180
ffff8801db621018 ffff88019b2e6fd0 ffffffff8280a0f2 0000000000000296
0000000000000002 0000000041b58ab3 00ffffff82e2af2a ffff8801db6218f0
Call Trace:
[<ffffffff8280b61f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
[<ffffffff81ad52b2>] blk_queue_enter+0x462/0x560 block/blk-core.c:664
[<ffffffff81ad5750>] generic_make_request+0x1b0/0x800 block/blk-core.c:2046
[<ffffffff81ad5e50>] submit_bio+0xb0/0x410 block/blk-core.c:2123
[<ffffffff815bf449>] submit_bh_wbc.isra.17+0x3a9/0x590 fs/buffer.c:3101
[<ffffffff815bfa7d>] __block_write_full_page+0x44d/0x810 fs/buffer.c:1789
[<ffffffff815c033e>] block_write_full_page+0x23e/0x2a0 fs/buffer.c:2977
[<ffffffff815c7374>] blkdev_writepage+0x24/0x30 fs/block_dev.c:312
[<ffffffff8142ef64>] __writepage+0x64/0xc0 mm/page-writeback.c:2293
[<ffffffff8142d995>] write_cache_pages+0x4d5/0xe80 mm/page-writeback.c:2231
[<ffffffff814329ca>] generic_writepages+0xda/0x150 mm/page-writeback.c:2317
[<ffffffff815c731d>] blkdev_writepages+0x1d/0x30 fs/block_dev.c:1764
[<ffffffff814340ef>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
[<ffffffff8159f2f9>] __writeback_single_inode+0xd9/0x1020
fs/fs-writeback.c:1320
[<ffffffff815a06ec>] writeback_sb_inodes+0x4ac/0xe70 fs/fs-writeback.c:1584
[<ffffffff815a11ab>] __writeback_inodes_wb+0xfb/0x1e0
fs/fs-writeback.c:1653
[<ffffffff815a17a2>] wb_writeback+0x512/0xbd0 fs/fs-writeback.c:1762
[<ffffffff815a4f1c>] wb_check_old_data_flush fs/fs-writeback.c:1877
[inline]
[<ffffffff815a4f1c>] wb_do_writeback fs/fs-writeback.c:1901 [inline]
[<ffffffff815a4f1c>] wb_workfn+0x8bc/0xe90 fs/fs-writeback.c:1930
[<ffffffff81131091>] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092
[<ffffffff81131f26>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
[<ffffffff81142ccd>] kthread+0x26d/0x300 kernel/kthread.c:211
[<ffffffff8281a55c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:

2 locks held by khungtaskd/24:
#0: (rcu_read_lock){......}, at: [<ffffffff8131c22c>]
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8131c22c>]
watchdog+0x11c/0xa20 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<ffffffff813feb1f>]
debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2030:
#0: (&tty->ldisc_sem){++++++}, at: [<ffffffff82818482>]
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
#1: (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81d38032>]
n_tty_read+0x202/0x1830 drivers/tty/n_tty.c:2156
3 locks held by kworker/u4:4/29348:
#0: ("writeback"){.+.+.+}, at: [<ffffffff81130f9c>]
process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
#1: ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff81130fd4>]
process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
#2: (&type->s_umount_key#22){.+.+..}, at: [<ffffffff81514bd0>]
trylock_super+0x20/0xf0 fs/super.c:393
3 locks held by syz-executor2/31247:
#0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff81de824c>]
lo_ioctl+0x8c/0x1910 drivers/block/loop.c:1372
#1: (lock#2){+.+...}, at: [<ffffffff8143f32a>]
lru_add_drain_all+0x4a/0x400 mm/swap.c:695
#2: (cpu_hotplug.dep_map){++++++}, at: [<ffffffff810e1b02>]
get_online_cpus+0x32/0x90 kernel/cpu.c:253
1 lock held by syz-executor2/31362:
#0: (&type->s_umount_key#32){++++++}, at: [<ffffffff815b2a16>]
SYSC_syncfs fs/sync.c:164 [inline]
#0: (&type->s_umount_key#32){++++++}, at: [<ffffffff815b2a16>]
SyS_syncfs+0x86/0xe0 fs/sync.c:154

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

NMI backtrace for cpu 0

CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.146+ #84
ffff8801d9907d08 ffffffff81b43aa9 0000000000000000 0000000000000000
0000000000000000 0000000000000001 ffffffff81098440 ffff8801d9907d40
ffffffff81b4ebb9 0000000000000000 0000000000000000 0000000000000003
Call Trace:
[<ffffffff81b43aa9>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81b43aa9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff81b4ebb9>] nmi_cpu_backtrace.cold.0+0x48/0x87
lib/nmi_backtrace.c:99
[<ffffffff81b4eb4c>] nmi_trigger_cpumask_backtrace+0x12c/0x151
lib/nmi_backtrace.c:60
[<ffffffff81098544>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<ffffffff8131c7bd>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<ffffffff8131c7bd>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff8131c7bd>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff8131c7bd>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
[<ffffffff81142ccd>] kthread+0x26d/0x300 kernel/kthread.c:211
[<ffffffff8281a55c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1

CPU: 1 PID: 31242 Comm: syz-executor1 Not tainted 4.9.146+ #84
task: ffff88019b7baf80 task.stack: ffff8801a6798000
RIP: 0033:[<0000000000401654>] c [<0000000000401654>] 0x401654
RSP: 002b:00007f49e765b710 EFLAGS: 00000282
RAX: 00000000cec2db1f RBX: 000000000000000b RCX: 0000000000457669
RDX: 0000000000000000 RSI: 00007f49e765b740 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000004bdbbd
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f49e765c700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000

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

CR2: 0000001b2fb23000 CR3: 00000001c5460000 CR4: 00000000001606b0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.

[syzbot]