INFO: task udevd:5821 blocked for more than 144 seconds.
Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:21464 pid:5821 tgid:5821 ppid:5193 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
wait_for_reconnect drivers/block/nbd.c:1043 [inline]
nbd_handle_cmd drivers/block/nbd.c:1085 [inline]
nbd_queue_rq+0x7d9/0x2ef0 drivers/block/nbd.c:1143
blk_mq_dispatch_rq_list+0xad3/0x19d0 block/blk-mq.c:2120
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
__blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309
blk_mq_sched_dispatch_requests+0xd6/0x190 block/blk-mq-sched.c:331
blk_mq_run_hw_queue+0x354/0x500 block/blk-mq.c:2354
blk_mq_flush_plug_list+0x118e/0x1870 block/blk-mq.c:2915
__blk_flush_plug+0x420/0x500 block/blk-core.c:1213
blk_finish_plug block/blk-core.c:1240 [inline]
__submit_bio+0x46a/0x560 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:710 [inline]
submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739
submit_bh fs/buffer.c:2819 [inline]
block_read_full_folio+0x93b/0xcd0 fs/buffer.c:2446
filemap_read_folio+0x14b/0x630 mm/filemap.c:2366
do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3826
read_mapping_folio include/linux/pagemap.h:1011 [inline]
read_part_sector+0xb3/0x330 block/partitions/core.c:722
adfspart_check_ICS+0xd9/0x9a0 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x72c/0x13f0 block/partitions/core.c:693
blkdev_get_whole+0x2d2/0x450 block/bdev.c:707
bdev_open+0x2d4/0xc50 block/bdev.c:916
blkdev_open+0x389/0x4f0 block/fops.c:627
do_dentry_open+0xbe1/0x1b70 fs/open.c:945
vfs_open+0x3e/0x330 fs/open.c:1075
do_open fs/namei.c:3828 [inline]
path_openat+0x2c84/0x3590 fs/namei.c:3987
do_filp_open+0x27f/0x4e0 fs/namei.c:4014
do_sys_openat2+0x13e/0x1d0 fs/open.c:1402
do_sys_open fs/open.c:1417 [inline]
__do_sys_openat fs/open.c:1433 [inline]
__se_sys_openat fs/open.c:1428 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1428
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb629f169a4
RSP: 002b:00007ffdce677de0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb629f169a4
RDX: 0000000000080000 RSI: 0000561805d8a4b0 RDI: 00000000ffffff9c
RBP: 0000561805d8a4b0 R08: 0000561805d9fa80 R09: 00007fb629ff1c10
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 0000561805d9fa80 R14: 0000000000000000 R15: 0000000000000001
Showing all locks held in the system:
1 lock held by ksoftirqd/0/16:
#0: ffff8880b863e758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606
1 lock held by khungtaskd/30:
#0: ffffffff8e937aa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937aa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937aa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
2 locks held by kworker/u8:4/77:
#0: ffff88814569d948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88814569d948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
#1: ffffc9000213fd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000213fd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
2 locks held by getty/5570:
#0: ffff88814d8320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by udevd/5821:
#0: ffff8881443464c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:904
#1: ffff88814435e910 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:158 [inline]
#1: ffff88814435e910 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:249 [inline]
#1: ffff88814435e910 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x32b/0x500 block/blk-mq.c:2354
#2: ffff88802553e178 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xfe/0x2ef0 drivers/block/nbd.c:1135
2 locks held by syz.0.81/6184:
#0: ffff8880788c20e0 (&type->s_umount_key#49/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
#1: ffff8881443464c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:904
3 locks held by udevd/6209:
#0: ffff88802543e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:904
#1: ffff888142be1f90 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:158 [inline]
#1: ffff888142be1f90 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:249 [inline]
#1: ffff888142be1f90 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x32b/0x500 block/blk-mq.c:2354
#2: ffff888025607178 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xfe/0x2ef0 drivers/block/nbd.c:1135
2 locks held by syz.1.475/7515:
#0: ffff88807ef1e0e0 (&type->s_umount_key#61/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
#1: ffff88802543e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:904
1 lock held by syz.4.569/7848:
#0: ffffffff8e93ce80 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4565
1 lock held by syz.4.569/7850:
2 locks held by dhcpcd/7854:
#0: ffff888045a56258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1617 [inline]
#0: ffff888045a56258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcb0 net/packet/af_packet.c:3267
#1: ffffffff8e93cfb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#1: ffffffff8e93cfb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xff6/0x1040 kernel/hung_task.c:397
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7850 Comm: syz.4.569 Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__lock_acquire+0x12d/0x2100 kernel/locking/lockdep.c:5123
Code: 0f 84 1a 13 00 00 49 8d bc 24 d8 0a 00 00 48 89 f8 48 c1 e8 03 48 89 44 24 30 0f b6 04 30 84 c0 48 89 3c 24 0f 85 4c 16 00 00 <8b> 17 48 c7 c0 c0 c9 38 9a 48 c1 e8 03 0f b6 04 30 84 c0 48 89 54
RSP: 0018:ffffc90003267310 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff93c46350 RCX: 0000000000000001
RDX: ffffffff93df5740 RSI: dffffc0000000000 RDI: ffff88802a108ad8
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff2030457 R12: ffff88802a108000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888079007950
FS: 00007f6bd1fd56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b941afa600 CR3: 000000005b82a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
__unix_dgram_recvmsg+0x246/0x12f0 net/unix/af_unix.c:2432
sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1033
____sys_recvmsg+0x3cd/0x480 net/socket.c:2801
___sys_recvmsg net/socket.c:2845 [inline]
do_recvmmsg+0x426/0xab0 net/socket.c:2940
__sys_recvmmsg net/socket.c:3014 [inline]
__do_sys_recvmmsg net/socket.c:3037 [inline]
__se_sys_recvmmsg net/socket.c:3030 [inline]
__x64_sys_recvmmsg+0x199/0x250 net/socket.c:3030
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bd417fed9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6bd1fd5058 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f6bd4346080 RCX: 00007f6bd417fed9
RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007f6bd41f3cc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6bd4346080 R15: 00007ffcc4af3698