INFO: task udevd:5242 blocked for more than 143 seconds.
Not tainted 6.11.0-rc1-syzkaller-00266-g45160cebd6ac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:20856 pid:5242 tgid:5242 ppid:4682 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
wait_for_reconnect drivers/block/nbd.c:1023 [inline]
nbd_handle_cmd drivers/block/nbd.c:1065 [inline]
nbd_queue_rq+0x7cd/0x2f70 drivers/block/nbd.c:1123
blk_mq_dispatch_rq_list+0xb89/0x1b30 block/blk-mq.c:2032
__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+0xcb/0x140 block/blk-mq-sched.c:331
blk_mq_run_hw_queue+0x576/0xae0 block/blk-mq.c:2245
blk_mq_flush_plug_list+0x1115/0x1880 block/blk-mq.c:2794
__blk_flush_plug+0x420/0x500 block/blk-core.c:1198
blk_finish_plug block/blk-core.c:1225 [inline]
__submit_bio+0x422/0x560 block/blk-core.c:623
__submit_bio_noacct_mq block/blk-core.c:696 [inline]
submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:725
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x93b/0xcd0 fs/buffer.c:2456
filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355
do_read_cache_folio+0x134/0x820 mm/filemap.c:3789
read_mapping_folio include/linux/pagemap.h:913 [inline]
read_part_sector+0xb3/0x330 block/partitions/core.c:712
adfspart_check_ICS+0xd9/0x9a0 block/partitions/acorn.c:360
check_partition block/partitions/core.c:138 [inline]
blk_add_partitions block/partitions/core.c:579 [inline]
bdev_disk_changed+0x72c/0x13d0 block/partitions/core.c:683
blkdev_get_whole+0x2d2/0x450 block/bdev.c:700
bdev_open+0x2d4/0xc60 block/bdev.c:909
blkdev_open+0x3e8/0x570 block/fops.c:630
do_dentry_open+0x970/0x1440 fs/open.c:959
vfs_open+0x3e/0x330 fs/open.c:1089
do_open fs/namei.c:3727 [inline]
path_openat+0x2b3e/0x3470 fs/namei.c:3886
do_filp_open+0x235/0x490 fs/namei.c:3913
do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
do_sys_open fs/open.c:1431 [inline]
__do_sys_openat fs/open.c:1447 [inline]
__se_sys_openat fs/open.c:1442 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1442
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: 0033:0x7f5395b169a4
RSP: 002b:00007ffddc4d0df0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000562e641b75e0 RCX: 00007f5395b169a4
RDX: 00000000000a0800 RSI: 0000562e6417f560 RDI: 00000000ffffff9c
RBP: 0000562e6417f560 R08: 0000000000000001 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 0000562e64191250 R14: 0000000000000001 R15: 0000562e6417e910
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e9377a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e9377a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e9377a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6620
4 locks held by kworker/u8:5/1112:
3 locks held by kworker/u8:10/2964:
2 locks held by getty/4979:
#0: ffff88802abf50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000311b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by udevd/5225:
#0: ffff88807aece4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff888022710590 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff888022710590 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff888022710590 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff8880568d0180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/5228:
#0: ffff88807c8454c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88802c01fb10 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88802c01fb10 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88802c01fb10 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff888076ee8180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/5242:
#0: ffff88801c2a04c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88807b6d0810 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88807b6d0810 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88807b6d0810 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff88805bc08180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/5537:
#0: ffff8880732d34c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff888023f3a890 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff888023f3a890 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff888023f3a890 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff888022c18180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
2 locks held by kworker/0:17/8516:
3 locks held by udevd/12515:
#0: ffff88805ef454c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88801f958710 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88801f958710 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88801f958710 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff88805ce98180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/12561:
#0: ffff88801c6c84c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff888025585c90 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff888025585c90 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff888025585c90 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff888056608180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/12742:
#0: ffff8880213f54c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff8880731b8810 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff8880731b8810 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff8880731b8810 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff888072e60180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/12943:
#0: ffff88805669f4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88802c3aee10 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88802c3aee10 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88802c3aee10 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff8880567e8180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/13283:
#0: ffff88807d22d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88801c7a6690 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88801c7a6690 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88801c7a6690 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff888056680180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/13327:
#0: ffff88806224e4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88801cb22110 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88801cb22110 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88801cb22110 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff88804f098180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/13448:
#0: ffff88805fc4d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88802519f390 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88802519f390 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88802519f390 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff88804a318180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
3 locks held by udevd/13475:
#0: ffff88802c21c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0xf0/0xc60 block/bdev.c:897
#1: ffff88805f562f10 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff88805f562f10 (set->srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff88805f562f10 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x54d/0xae0 block/blk-mq.c:2245
#2: ffff88803a150180 (&cmd->lock){+.+.}-{3:3}, at: nbd_queue_rq+0xfc/0x2f70 drivers/block/nbd.c:1115
2 locks held by syz.0.3280/16677:
#0: ffffffff8fc735d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x560 net/core/net_namespace.c:490
#1: ffffffff8fc80048 (rtnl_mutex){+.+.}-{3:3}, at: setup_net+0x602/0x9e0 net/core/net_namespace.c:378
2 locks held by syz.1.3282/16682:
#0: ffff8880586eb808 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline]
#0: ffff8880586eb808 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
#0: ffff8880586eb808 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1421
#1: ffffffff8e93cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline]
#1: ffffffff8e93cb78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc1-syzkaller-00266-g45160cebd6ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
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:223 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:379
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16677 Comm: syz.0.3280 Not tainted 6.11.0-rc1-syzkaller-00266-g45160cebd6ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:preempt_count_add+0x44/0x190 kernel/sched/core.c:5656
Code: 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 ed 00 00 00 83 3d bc 3a 8f 13 00 75 07 65 8b 05 7b f8 a0 7e 65 01 1d 74 f8 a0 7e <48> c7 c0 80 19 f2 94 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e4 00
RSP: 0018:ffffc9000a70f228 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff94f21903
RDX: ffff888072fa5a00 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc9000a70f320 R08: ffffffff814107f1 R09: ffffc9000a70f410
R10: 0000000000000003 R11: ffffffff817f0ca0 R12: ffff888072fa5a00
R13: dffffc0000000000 R14: 0000000000000001 R15: dffffc0000000000
FS: 00007f750b5e16c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5542d2ab8 CR3: 0000000075580000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
unwind_next_frame+0xc1/0x2a00 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4189
kmalloc_noprof include/linux/slab.h:681 [inline]
kzalloc_noprof include/linux/slab.h:807 [inline]
kobject_uevent_env+0x28b/0x8e0 lib/kobject_uevent.c:540
__kobject_del+0xd3/0x310 lib/kobject.c:601
kobject_cleanup lib/kobject.c:680 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x245/0x480 lib/kobject.c:737
net_rx_queue_update_kobjects+0x52b/0x5b0 net/core/net-sysfs.c:1174
remove_queue_kobjects net/core/net-sysfs.c:1950 [inline]
netdev_unregister_kobject+0x104/0x250 net/core/net-sysfs.c:2104
unregister_netdevice_many_notify+0x1709/0x1c40 net/core/dev.c:11378
setup_net+0x6c1/0x9e0 net/core/net_namespace.c:383
copy_net_ns+0x33f/0x560 net/core/net_namespace.c:494
create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
ksys_unshare+0x619/0xc10 kernel/fork.c:3309
__do_sys_unshare kernel/fork.c:3380 [inline]
__se_sys_unshare kernel/fork.c:3378 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3378
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: 0033:0x7f750a7779f9
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:00007f750b5e1048 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f750a905f80 RCX: 00007f750a7779f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000068040200
RBP: 00007f750a7e58ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f750a905f80 R15: 00007ffc6f175708