INFO: task udevd:4260 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:25264 pid: 4260 ppid: 3557 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
wait_on_page_bit_common+0x8bf/0xeb0 mm/filemap.c:1356
wait_on_page_bit mm/filemap.c:1417 [inline]
wait_on_page_locked include/linux/pagemap.h:688 [inline]
wait_on_page_read mm/filemap.c:3437 [inline]
do_read_cache_page+0xae6/0x1010 mm/filemap.c:3480
read_mapping_page include/linux/pagemap.h:515 [inline]
read_part_sector+0xd7/0x4c0 block/partitions/core.c:726
adfspart_check_ICS+0xc3/0xe90 block/partitions/acorn.c:360
check_partition block/partitions/core.c:148 [inline]
blk_add_partitions block/partitions/core.c:611 [inline]
bdev_disk_changed+0x936/0x1690 block/partitions/core.c:697
blkdev_get_whole+0x2f9/0x390 block/bdev.c:678
blkdev_get_by_dev+0x2da/0xa50 block/bdev.c:823
blkdev_open+0x128/0x2c0 block/fops.c:466
do_dentry_open+0x7f7/0xf90 fs/open.c:826
do_open fs/namei.c:3659 [inline]
path_openat+0x2718/0x2fb0 fs/namei.c:3793
do_filp_open+0x1df/0x400 fs/namei.c:3820
do_sys_openat2+0x14b/0x500 fs/open.c:1255
do_sys_open fs/open.c:1271 [inline]
__do_sys_openat fs/open.c:1287 [inline]
__se_sys_openat fs/open.c:1282 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1282
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6eba803407
RSP: 002b:00007ffd4f8facd0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6eba715880 RCX: 00007f6eba803407
RDX: 00000000000a0800 RSI: 000055e8e7975d40 RDI: ffffffffffffff9c
RBP: 000055e8e7962910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055e8e797ae00
R13: 000055e8e797a410 R14: 0000000000000000 R15: 000055e8e797ae00
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:2/154:
2 locks held by getty/3941:
#0: ffff88814cd4a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
4 locks held by kworker/0:7/4227:
#0: ffff8881421e2538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc900030cfd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffff888147ff6220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:809 [inline]
#2: ffff888147ff6220 (&dev->mutex){....}-{3:3}, at: hub_event+0x178/0x5260 drivers/usb/core/hub.c:5832
#3: ffff888060d87220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:809 [inline]
#3: ffff888060d87220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x85/0x480 drivers/base/dd.c:974
1 lock held by udevd/4260:
#0: ffff888020b34518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x162/0xa50 block/bdev.c:816
4 locks held by udevd/4331:
#0: ffff888053fa5e80 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0x9d/0xc50 fs/seq_file.c:182
#1: ffff888056044888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x55/0x3c0 fs/kernfs/file.c:112
#2: ffff888147e7f3a8 (kn->active#32){++++}-{0:0}, at: kernfs_seq_start+0x75/0x3c0 fs/kernfs/file.c:113
#3: ffff888147ff6220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:809 [inline]
#3: ffff888147ff6220 (&dev->mutex){....}-{3:3}, at: uevent_show+0x16c/0x320 drivers/base/core.c:2408
2 locks held by udevd/5739:
3 locks held by syz.5.614/6645:
#0: ffff88802b12a0e0 (&type->s_umount_key#68/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229
#1: ffff88802b12a650 (sb_internal#2){.+.+}-{0:0}, at: xfs_qm_qino_alloc+0x3fc/0x990 fs/xfs/xfs_qm.c:779
#2: ffffffff8c3ef5e0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: __debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
#2: ffffffff8c3ef5e0 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: debug_check_no_obj_freed+0x9a/0x520 lib/debugobjects.c:1020
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4993 Comm: kworker/u4:12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:stack_trace_consume_entry+0x3/0x270 kernel/stacktrace.c:83
Code: c7 44 33 08 00 00 00 00 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 78 75 09 48 8d 65 f0 5b 41 5e 5d c3 e8 61 85 5a 08 90 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00 00 00 00 fc ff df 4c
RSP: 0018:ffffc9000315ef70 EFLAGS: 00000282
RAX: ffffffff8164e9e5 RBX: ffffc9000315f040 RCX: 0000000080000201
RDX: 0000000000000001 RSI: ffffffff8164e9e5 RDI: ffffc9000315f040
RBP: ffffc9000315f010 R08: ffffc9000315f300 R09: ffffc9000315efd8
R10: dffffc0000000000 R11: fffff5200062bdfd R12: ffff888023cc3b80
R13: dffffc0000000000 R14: ffffffff81679160 R15: ffffc9000315ef88
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6eb9dc8000 CR3: 0000000053b69000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
kvfree_call_rcu+0x105/0x7f0 kernel/rcu/tree.c:3600
cfg80211_update_known_bss+0x184/0xb60 net/wireless/scan.c:-1
cfg80211_bss_update+0x156/0x21f0 net/wireless/scan.c:1830
cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2559 [inline]
cfg80211_inform_bss_frame_data+0x88d/0x1ed0 net/wireless/scan.c:2592
ieee80211_bss_info_update+0x6ba/0xa80 net/mac80211/scan.c:190
ieee80211_rx_bss_info net/mac80211/ibss.c:1123 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1763/0x2b50 net/mac80211/ibss.c:1643
ieee80211_iface_process_skb net/mac80211/iface.c:1467 [inline]
ieee80211_iface_work+0x714/0xc50 net/mac80211/iface.c:1521
cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287