INFO: task udevd:19788 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:22088 pid:19788 tgid:19788 ppid:4989 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
io_schedule+0x7f/0xd0 kernel/sched/core.c:8110
folio_wait_bit_common+0x6d8/0xbc0 mm/filemap.c:1324
folio_put_wait_locked mm/filemap.c:1493 [inline]
do_read_cache_folio+0x1ad/0x590 mm/filemap.c:4089
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xb6/0x2b0 block/partitions/core.c:724
adfspart_check_POWERTEC+0x9a/0x7a0 block/partitions/acorn.c:450
check_partition block/partitions/core.c:143 [inline]
blk_add_partitions block/partitions/core.c:591 [inline]
bdev_disk_changed+0x817/0x1770 block/partitions/core.c:695
blkdev_get_whole+0x380/0x510 block/bdev.c:756
bdev_open+0x31e/0xd30 block/bdev.c:965
blkdev_open+0x470/0x610 block/fops.c:697
do_dentry_open+0x785/0x14e0 fs/open.c:947
vfs_open+0x3b/0x340 fs/open.c:1079
do_open fs/namei.c:4699 [inline]
path_openat+0x2e08/0x3860 fs/namei.c:4858
do_file_open+0x23e/0x4a0 fs/namei.c:4887
do_sys_openat2+0x113/0x200 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1381
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f7bea7407
RSP: 002b:00007ffe82cfa9b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f8f7c56b880 RCX: 00007f8f7bea7407
RDX: 00000000000a0800 RSI: 000055f4156df920 RDI: ffffffffffffff9c
RBP: 000055f4156b7910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055f4156de6d0
R13: 000055f4156c5190 R14: 0000000000000000 R15: 000055f4156de6d0
Showing all locks held in the system:
1 lock held by khungtaskd/32:
#0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by syslogd/4971:
#0: ffff8880b873aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:652
2 locks held by getty/5378:
#0: ffff8880330e80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
1 lock held by udevd/19788:
#0: ffff888027050350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30 block/bdev.c:953
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 23956 Comm: kworker/u8:22 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:poison_slab_object mm/kasan/common.c:253 [inline]
RIP: 0010:__kasan_slab_free+0x54/0x80 mm/kasan/common.c:285
Code: 75 35 40 20 c6 75 30 44 89 c5 49 89 fe 8b 77 1c ff ce 83 ce 07 ff c6 0f b6 ca 48 89 df ba fb 00 00 00 e8 ef 37 00 00 4c 89 f7 <48> 89 de e8 24 2c 00 00 40 84 ed 74 0c 31 c0 5b 41 5e 5d e9 cf 6f
RSP: 0018:ffffc9000394ed40 EFLAGS: 00000203
RAX: ffffed1009fbb200 RBX: ffff88804fdd9000 RCX: 0000000000000000
RDX: 0000000000000080 RSI: 00000000000000fb RDI: ffff88813fe1adc0
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1009fbb200
R10: dffffc0000000000 R11: fffffbfff2061a7f R12: ffff88804fdd9000
R13: 0000000000000000 R14: ffff88813fe1adc0 R15: ffff88813fe1adc0
FS: 0000000000000000(0000) GS:ffff888125387000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055573495f168 CR3: 000000000e74a000 CR4: 0000000000350ef0
Call Trace:
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6250 [inline]
kfree+0x1c5/0x640 mm/slub.c:6565
ieee80211_inform_bss+0xc75/0x1160 net/mac80211/scan.c:164
rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
cfg80211_inform_single_bss_data+0xcf9/0x1af0 net/wireless/scan.c:2372
cfg80211_inform_bss_data+0x266/0x3c40 net/wireless/scan.c:3229
cfg80211_inform_bss_frame_data+0x3c7/0x730 net/wireless/scan.c:3320
ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230
ieee80211_rx_bss_info net/mac80211/ibss.c:1088 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1569 [inline]
ieee80211_ibss_rx_queued_mgmt+0x1901/0x2cb0 net/mac80211/ibss.c:1596
ieee80211_iface_process_skb net/mac80211/iface.c:1795 [inline]
ieee80211_iface_work+0x845/0x1380 net/mac80211/iface.c:1849
cfg80211_wiphy_work+0x2cf/0x460 net/wireless/core.c:513
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
----------------
Code disassembly (best guess):
0: 75 35 jne 0x37
2: 40 20 c6 and %al,%sil
5: 75 30 jne 0x37
7: 44 89 c5 mov %r8d,%ebp
a: 49 89 fe mov %rdi,%r14
d: 8b 77 1c mov 0x1c(%rdi),%esi
10: ff ce dec %esi
12: 83 ce 07 or $0x7,%esi
15: ff c6 inc %esi
17: 0f b6 ca movzbl %dl,%ecx
1a: 48 89 df mov %rbx,%rdi
1d: ba fb 00 00 00 mov $0xfb,%edx
22: e8 ef 37 00 00 call 0x3816
27: 4c 89 f7 mov %r14,%rdi
* 2a: 48 89 de mov %rbx,%rsi <-- trapping instruction
2d: e8 24 2c 00 00 call 0x2c56
32: 40 84 ed test %bpl,%bpl
35: 74 0c je 0x43
37: 31 c0 xor %eax,%eax
39: 5b pop %rbx
3a: 41 5e pop %r14
3c: 5d pop %rbp
3d: e9 .byte 0xe9
3e: cf iret
3f: 6f outsl %ds:(%rsi),(%dx)