INFO: task udevd:5778 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:24176 pid:5778 ppid:5138 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
io_schedule+0x80/0xd0 kernel/sched/core.c:9022
folio_wait_bit_common+0x6eb/0xf70 mm/filemap.c:1329
folio_put_wait_locked mm/filemap.c:1493 [inline]
do_read_cache_folio+0x1c0/0x7e0 mm/filemap.c:3786
read_mapping_folio include/linux/pagemap.h:898 [inline]
read_part_sector+0xd2/0x350 block/partitions/core.c:718
adfspart_check_POWERTEC+0x8d/0xf00 block/partitions/acorn.c:454
check_partition block/partitions/core.c:138 [inline]
blk_add_partitions block/partitions/core.c:600 [inline]
bdev_disk_changed+0x73a/0x1410 block/partitions/core.c:689
blkdev_get_whole+0x30d/0x390 block/bdev.c:672
blkdev_get_by_dev+0x279/0x600 block/bdev.c:814
blkdev_open+0x152/0x360 block/fops.c:589
do_dentry_open+0x8c6/0x1500 fs/open.c:929
do_open fs/namei.c:3640 [inline]
path_openat+0x274b/0x3190 fs/namei.c:3797
do_filp_open+0x1c5/0x3d0 fs/namei.c:3824
do_sys_openat2+0x12c/0x1c0 fs/open.c:1421
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe1384a7407
RSP: 002b:00007fff62c01050 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe138bff880 RCX: 00007fe1384a7407
RDX: 00000000000a0800 RSI: 0000560f5e36b0f0 RDI: ffffffffffffff9c
RBP: 0000560f5e353910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000560f5e3747d0
R13: 0000560f5e36b410 R14: 0000000000000000 R15: 0000560f5e3747d0
Showing all locks held in the system:
4 locks held by kworker/u4:0/11:
#0: ffff88814127ad38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff88814127ad38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc90000107d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90000107d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#2: ffff88802948e0e0 (&type->s_umount_key#61){++++}-{3:3}, at: super_trylock_shared+0x20/0xf0 fs/super.c:607
#3: ffff88802fdfa0b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x154/0x1d0 fs/hfsplus/bfind.c:28
1 lock held by khungtaskd/29:
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:7/1310:
2 locks held by getty/5530:
#0:
ffff88814cffc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
1 lock held by udevd/5778:
#0: ffff8880213024c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x121/0x600 block/bdev.c:805
8 locks held by syz-executor/6199:
4 locks held by syz.2.842/11395:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11830 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:xas_next_entry+0x92/0x3d0 include/linux/xarray.h:1699
Code: c1 e8 03 0f b6 04 18 84 c0 0f 85 15 03 00 00 41 0f b6 2c 24 31 ff 89 ee e8 1b 7d d2 ff 85 ed 0f 85 f1 02 00 00 4c 89 64 24 18 <49> 8d 4f 12 48 89 0c 24 48 c1 e9 03 48 89 4c 24 20 0f b6 04 19 84
RSP: 0000:ffffc9001638fa00 EFLAGS: 00000246
RAX: ffffffff81b31635 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8880313eda00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffea0001dbc377 R09: 1ffffd40003b786e
R10: dffffc0000000000 R11: fffff940003b786f R12: ffff888021d56680
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9001638fbc0
FS: 000055555da0c500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f89a51763 CR3: 0000000048f4d000 CR4: 00000000003506e0
Call Trace:
next_uptodate_folio+0x33/0xae0 mm/filemap.c:3481
filemap_map_pages+0xfad/0x1950 mm/filemap.c:3669
do_fault_around mm/memory.c:4595 [inline]
do_read_fault mm/memory.c:4628 [inline]
do_fault mm/memory.c:4775 [inline]
do_pte_missing mm/memory.c:3689 [inline]
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5188 [inline]
handle_mm_fault+0x379b/0x4920 mm/memory.c:5353
do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324
handle_page_fault arch/x86/mm/fault.c:1465 [inline]
exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f1f899aa51b
Code: b9 cd cc cc cc cc cc cc cc 48 89 f1 0f 1f 00 48 89 f8 48 89 fe 48 83 e9 01 49 f7 e1 48 c1 ea 03 48 8d 04 92 48 01 c0 48 29 c6 <41> 0f b6 04 30 88 01 48 89 f8 48 89 d7 48 83 f8 09 77 d2 48 89 c8
RSP: 002b:00007ffdcfc17158 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007ffdcfc176c0 RCX: 00007ffdcfc17667
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 0000000000000016 R08: 00007f1f89a51760 R09: cccccccccccccccd
R10: 00000000ffffffff R11: 0000000000000001 R12: 0000000000000075
R13: 00007ffdcfc17840 R14: 00007ffdcfc17668 R15: 0000000000000003