INFO: task udevd:15637 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:25144 pid:15637 tgid:15637 ppid:4971 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7376
io_schedule+0x8a/0xf0 kernel/sched/core.c:8220
folio_wait_bit_common+0x414/0xa80 mm/filemap.c:1329
folio_put_wait_locked mm/filemap.c:1498 [inline]
do_read_cache_folio+0x3bc/0x6b0 mm/filemap.c:4138
read_mapping_folio include/linux/pagemap.h:1015 [inline]
read_part_sector+0xd1/0x370 block/partitions/core.c:724
adfspart_check_POWERTEC+0x8a/0x630 block/partitions/acorn.c:451
check_partition block/partitions/core.c:143 [inline]
blk_add_partitions block/partitions/core.c:591 [inline]
bdev_disk_changed+0x7b1/0x1260 block/partitions/core.c:695
blkdev_get_whole+0x187/0x290 block/bdev.c:793
bdev_open+0x2c7/0xe40 block/bdev.c:1002
blkdev_open+0x34e/0x4f0 block/fops.c:674
do_dentry_open+0x6ab/0x14d0 fs/open.c:996
vfs_open+0x82/0x3f0 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x19fa/0x2440 fs/namei.c:5000
do_file_open+0x20e/0x430 fs/namei.c:5029
do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9a778a7407
RSP: 002b:00007ffe9c0050a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9a7809d880 RCX: 00007f9a778a7407
RDX: 00000000000a0800 RSI: 000055c8186f7610 RDI: ffffffffffffff9c
RBP: 000055c8186f42c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055c818936d50
R13: 000055c81892f8d0 R14: 0000000000000000 R15: 000055c818936d50
Showing all locks held in the system:
locks held by khungtaskd/31: 1, last CPU#0:
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by getty/5358: 2, on CPU#0:
#0: ffff8880386750a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000321e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by udevd/15637: 1, on CPU#0:
#0: ffff888028143350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by syz-executor/16288: 4, last CPU#1:
#0: ffffffff8ef3deb0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1542 [inline]
#0: ffffffff8ef3deb0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1595 [inline]
#0: ffffffff8ef3deb0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x4806/0x8370 kernel/fork.c:2310
#1: ffff88803473dcf8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#1: ffff88803473dcf8 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x127/0x2370 mm/mmap.c:1716
#2: ffff888078ed83b8 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:552 [inline]
#2: ffff888078ed83b8 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1c9/0x2370 mm/mmap.c:1723
#3: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#3: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#3: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310 mm/pgtable-generic.c:290
locks held by syz.3.5299/24366: 1, last CPU#1:
#0: ffffffff8efcb1e0 (fs_reclaim){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8efcb1e0 (fs_reclaim){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8efcb1e0 (fs_reclaim){+.+.}-{0:0}, at: is_bpf_text_address+0x25/0x1a0 kernel/bpf/core.c:750
locks held by syz.1.5307/24394: 1, last CPU#0:
#0: ffff888027389f70 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x255/0xc30 net/unix/af_unix.c:2587
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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: 24366 Comm: syz.3.5299 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__nr_to_section+0x98/0x100 include/linux/mmzone.h:2067
Code: 48 85 ed 74 54 e8 b8 53 80 ff 4a 8d 6c e5 00 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 75 57 48 8b 6d 00 <48> 85 ed 74 2a e8 8e 53 80 ff 83 e3 7f e8 86 53 80 ff 48 c1 e3 05
RSP: 0018:ffffc900042def50 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000012 RCX: ffffc9000f1dc000
RDX: 1ffff11047ffc600 RSI: ffffffff828bcef8 RDI: ffff888066948000
RBP: ffff88813fe25000 R08: 0000000000000006 R09: 0000000000001000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff9200085be09 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f0673a1c6c0(0000) GS:ffff888123c52000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f64697556c8 CR3: 0000000051b6d000 CR4: 00000000003526f0
Call Trace:
__pfn_to_section include/linux/mmzone.h:2193 [inline]
lookup_page_ext+0x46/0x100 mm/page_ext.c:250
page_ext_iter_begin include/linux/page_ext.h:136 [inline]
__update_page_owner_handle+0x111/0x530 mm/page_owner.c:274
__set_page_owner+0x11f/0x540 mm/page_owner.c:360
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
__alloc_pages_noprof mm/page_alloc.c:5471 [inline]
alloc_pages_bulk_noprof+0x5e1/0x13c0 mm/page_alloc.c:5295
___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
__kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline]
__kasan_populate_vmalloc+0xf0/0x210 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2145
__get_vm_area_node+0x1ed/0x350 mm/vmalloc.c:3248
get_vm_area+0x73/0xa0 mm/vmalloc.c:3290
arena_map_alloc+0x2a0/0x8e0 kernel/bpf/arena.c:296
map_create_alloc kernel/bpf/syscall.c:1534 [inline]
map_create+0x874/0x30d0 kernel/bpf/syscall.c:1644
__sys_bpf+0x12a0/0x4a30 kernel/bpf/syscall.c:6347
__do_sys_bpf kernel/bpf/syscall.c:6489 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6486 [inline]
__x64_sys_bpf+0xce/0x140 kernel/bpf/syscall.c:6486
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0672b9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0673a1c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0672e25fa0 RCX: 00007f0672b9e159
RDX: 0000000000000048 RSI: 0000200000003940 RDI: 0000000000000000
RBP: 00007f0672c3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0672e26038 R14: 00007f0672e25fa0 R15: 00007ffcb6154a28