syzbot

INFO: task syz-executor.3:20761 can't die for more than 143 seconds.
task:syz-executor.3  state:D stack:25144 pid:20761 ppid:  6551 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4987 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6268
 schedule+0xd2/0x260 kernel/sched/core.c:6341
 __bio_queue_enter+0x3c5/0x6a0 block/blk-core.c:441
 bio_queue_enter block/blk.h:91 [inline]
 blk_mq_get_request block/blk-mq.c:2588 [inline]
 blk_mq_submit_bio+0x4ae/0x22c0 block/blk-mq.c:2632
 __submit_bio block/blk-core.c:849 [inline]
 __submit_bio_noacct_mq block/blk-core.c:924 [inline]
 submit_bio_noacct block/blk-core.c:950 [inline]
 submit_bio_noacct+0x82c/0xa20 block/blk-core.c:939
 submit_bio block/blk-core.c:1011 [inline]
 submit_bio+0x1ea/0x430 block/blk-core.c:969
 __blkdev_direct_IO_simple+0x4a2/0x860 block/fops.c:103
 blkdev_direct_IO block/fops.c:383 [inline]
 blkdev_direct_IO+0x7fb/0x1740 block/fops.c:373
 generic_file_direct_write+0x1e8/0x540 mm/filemap.c:3680
 __generic_file_write_iter+0x24c/0x510 mm/filemap.c:3840
 blkdev_write_iter+0x3f2/0x690 block/fops.c:557
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x472/0x750 fs/read_write.c:725
 do_iter_write+0x188/0x710 fs/read_write.c:851
 vfs_iter_write+0x70/0xa0 fs/read_write.c:892
 iter_file_splice_write+0x723/0xc70 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x110/0x180 fs/splice.c:936
 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
 do_splice_direct+0x1b3/0x280 fs/splice.c:979
 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f93ce1b3ae9
RSP: 002b:00007f93cb729188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f93ce2c6f60 RCX: 00007f93ce1b3ae9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007f93ce20df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024002da8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff1e83a70f R14: 00007f93cb729300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:20761 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:25144 pid:20761 ppid:  6551 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4987 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6268
 schedule+0xd2/0x260 kernel/sched/core.c:6341
 __bio_queue_enter+0x3c5/0x6a0 block/blk-core.c:441
 bio_queue_enter block/blk.h:91 [inline]
 blk_mq_get_request block/blk-mq.c:2588 [inline]
 blk_mq_submit_bio+0x4ae/0x22c0 block/blk-mq.c:2632
 __submit_bio block/blk-core.c:849 [inline]
 __submit_bio_noacct_mq block/blk-core.c:924 [inline]
 submit_bio_noacct block/blk-core.c:950 [inline]
 submit_bio_noacct+0x82c/0xa20 block/blk-core.c:939
 submit_bio block/blk-core.c:1011 [inline]
 submit_bio+0x1ea/0x430 block/blk-core.c:969
 __blkdev_direct_IO_simple+0x4a2/0x860 block/fops.c:103
 blkdev_direct_IO block/fops.c:383 [inline]
 blkdev_direct_IO+0x7fb/0x1740 block/fops.c:373
 generic_file_direct_write+0x1e8/0x540 mm/filemap.c:3680
 __generic_file_write_iter+0x24c/0x510 mm/filemap.c:3840
 blkdev_write_iter+0x3f2/0x690 block/fops.c:557
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x472/0x750 fs/read_write.c:725
 do_iter_write+0x188/0x710 fs/read_write.c:851
 vfs_iter_write+0x70/0xa0 fs/read_write.c:892
 iter_file_splice_write+0x723/0xc70 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x110/0x180 fs/splice.c:936
 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
 do_splice_direct+0x1b3/0x280 fs/splice.c:979
 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f93ce1b3ae9
RSP: 002b:00007f93cb729188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f93ce2c6f60 RCX: 00007f93ce1b3ae9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004
RBP: 00007f93ce20df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024002da8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff1e83a70f R14: 00007f93cb729300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:20769 can't die for more than 144 seconds.
task:syz-executor.3  state:D stack:28480 pid:20769 ppid:  6551 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4987 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6268
 schedule+0xd2/0x260 kernel/sched/core.c:6341
 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
 loop_set_status+0x440/0x930 drivers/block/loop.c:1264
 loop_set_status_old+0x148/0x1b0 drivers/block/loop.c:1396
 lo_ioctl+0x3e9/0x17c0 drivers/block/loop.c:1566
 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f93ce1b3ae9
RSP: 002b:00007f93cb708188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f93ce2c7020 RCX: 00007f93ce1b3ae9
RDX: 0000000020000400 RSI: 0000000000004c02 RDI: 0000000000000004
RBP: 00007f93ce20df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff1e83a70f R14: 00007f93cb708300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:20769 blocked for more than 144 seconds.
      Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:28480 pid:20769 ppid:  6551 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4987 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6268
 schedule+0xd2/0x260 kernel/sched/core.c:6341
 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
 loop_set_status+0x440/0x930 drivers/block/loop.c:1264
 loop_set_status_old+0x148/0x1b0 drivers/block/loop.c:1396
 lo_ioctl+0x3e9/0x17c0 drivers/block/loop.c:1566
 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f93ce1b3ae9
RSP: 002b:00007f93cb708188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f93ce2c7020 RCX: 00007f93ce1b3ae9
RDX: 0000000020000400 RSI: 0000000000004c02 RDI: 0000000000000004
RBP: 00007f93ce20df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff1e83a70f R14: 00007f93cb708300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by systemd/1:
 #0: ffff8880b9d39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
1 lock held by khungtaskd/26:
 #0: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
3 locks held by kworker/u4:4/369:
 #0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
 #1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x173/0x490 kernel/sched/psi.c:871
 #2: ffff8880b9c28298 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:946
2 locks held by systemd-udevd/2971:
 #0: ffff88801a975118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
 #1: ffff88801a970b60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_open+0x75/0x120 drivers/block/loop.c:1733
1 lock held by in:imklog/6445:
 #0: ffff88807bca7270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
1 lock held by syz-executor.3/20769:
 #0: ffff88801a970b60 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_set_status+0x2a/0x930 drivers/block/loop.c:1248

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

NMI backtrace for cpu 1
CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
 watchdog+0xcb7/0xed0 kernel/hung_task.c:339
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 369 Comm: kworker/u4:4 Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue:  0x0 (bat_events)
RIP: 0010:rb_erase+0x11/0x1210 lib/rbtree.c:441
Code: 54 24 08 4c 8b 04 24 e9 f7 f5 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 b8 00 00 00 00 00 fc ff df 41 57 49 89 f7 41 56 <41> 55 49 89 fd 48 83 c7 08 48 89 fa 41 54 48 c1 ea 03 55 53 48 83
RSP: 0018:ffffc90002effc48 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff88801191d840 RCX: 1ffff11017387371
RDX: dffffc0000000000 RSI: ffff8880b9c39b80 RDI: ffff88801191d850
RBP: ffff8880b9c39b40 R08: ffff8880b9c39b40 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88801191d850
R13: ffff8880b9c39cb0 R14: ffff8880b9c39b88 R15: ffff8880b9c39b80
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2f489f0000 CR3: 000000000b88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rb_erase_cached include/linux/rbtree.h:126 [inline]
 __dequeue_entity kernel/sched/fair.c:593 [inline]
 set_next_entity+0x334/0x5e0 kernel/sched/fair.c:4436
 pick_next_task_fair+0x6ab/0xe00 kernel/sched/fair.c:7309
 __pick_next_task kernel/sched/core.c:5608 [inline]
 pick_next_task kernel/sched/core.c:5680 [inline]
 __schedule+0x3e8/0x4940 kernel/sched/core.c:6232
 schedule+0xd2/0x260 kernel/sched/core.c:6341
 worker_thread+0x15c/0x11f0 kernel/workqueue.c:2466
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	24 08                	and    $0x8,%al
   3:	4c 8b 04 24          	mov    (%rsp),%r8
   7:	e9 f7 f5 ff ff       	jmpq   0xfffff603
   c:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  13:	00 00 00 00
  17:	66 90                	xchg   %ax,%ax
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	41 57                	push   %r15
  25:	49 89 f7             	mov    %rsi,%r15
  28:	41 56                	push   %r14
* 2a:	41 55                	push   %r13 <-- trapping instruction
  2c:	49 89 fd             	mov    %rdi,%r13
  2f:	48 83 c7 08          	add    $0x8,%rdi
  33:	48 89 fa             	mov    %rdi,%rdx
  36:	41 54                	push   %r12
  38:	48 c1 ea 03          	shr    $0x3,%rdx
  3c:	55                   	push   %rbp
  3d:	53                   	push   %rbx
  3e:	48                   	rex.W
  3f:	83                   	.byte 0x83