INFO: task udevd:13882 blocked for more than 144 seconds.
Not tainted 6.15.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:23944 pid:13882 tgid:13882 ppid:5187 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
bdev_open+0x41a/0xe40 block/bdev.c:945
blkdev_open+0x280/0x3f0 block/fops.c:652
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f60b0ca7407
RSP: 002b:00007ffecfcec550 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f60b134c880 RCX: 00007f60b0ca7407
RDX: 00000000000a0800 RSI: 0000558fa00cc670 RDI: ffffffffffffff9c
RBP: 0000558fa00c92c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000558fa030b080
R13: 0000558fa030e8f0 R14: 0000000000000000 R15: 0000558fa030b080
INFO: task syz.0.1703:15155 blocked for more than 145 seconds.
Not tainted 6.15.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1703 state:D stack:27416 pid:15155 tgid:15153 ppid:14455 task_flags:0x400140 flags:0x00024004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
bdev_release+0x15a/0x6d0 block/bdev.c:1128
blkdev_release+0x15/0x20 block/fops.c:660
__fput+0x3ff/0xb70 fs/file_table.c:465
task_work_run+0x14d/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc09538e969
RSP: 002b:00007fc096222038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007fc0955b6080 RCX: 00007fc09538e969
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007fc095410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc0955b6080 R15: 00007ffc4f3363a8
INFO: task syz.0.1703:15157 blocked for more than 145 seconds.
Not tainted 6.15.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1703 state:D stack:24088 pid:15157 tgid:15153 ppid:14455 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
io_schedule+0xbf/0x130 kernel/sched/core.c:7742
folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
folio_put_wait_locked mm/filemap.c:1481 [inline]
do_read_cache_folio+0x342/0x5c0 mm/filemap.c:3867
read_mapping_folio include/linux/pagemap.h:995 [inline]
read_part_sector+0xd4/0x310 block/partitions/core.c:722
adfspart_check_POWERTEC+0x8a/0x710 block/partitions/acorn.c:454
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x720/0x1520 block/partitions/core.c:693
blkdev_get_whole+0x187/0x290 block/bdev.c:748
bdev_open+0x2c7/0xe40 block/bdev.c:957
blkdev_open+0x280/0x3f0 block/fops.c:652
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc09538d2d0
RSP: 002b:00007fc096200b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc09538d2d0
RDX: 0000000000000000 RSI: 00007fc096200c10 RDI: 00000000ffffff9c
RBP: 00007fc096200c10 R08: 0000000000000000 R09: 002364626e2f7665
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc0955b6160 R15: 00007ffc4f3363a8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3bf580 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3bf580 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3bf580 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
3 locks held by kworker/u8:2/36:
2 locks held by kworker/u8:4/62:
#0: ffff888147eba948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90001547d18 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
2 locks held by getty/5577:
#0: ffff88814e0d10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900036442f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by udevd/13882:
#0: ffff8880261f6358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:945
1 lock held by syz.0.1703/15155:
#0: ffff8880261f6358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x15a/0x6d0 block/bdev.c:1128
1 lock held by syz.0.1703/15157:
#0: ffff8880261f6358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:945
1 lock held by cmp/17029:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5800 Comm: syz-executor Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:sock_recvmsg_nosec net/socket.c:1017 [inline]
RIP: 0010:sock_recvmsg+0xb3/0x250 net/socket.c:1039
Code: 3c 02 00 0f 85 92 01 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5c 24 20 48 8d bb 90 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 54 01 00 00 4c 89 f2 48 8b 9b 90 00 00 00 48 b8 00 00 00 00
RSP: 0018:ffffc90003f67bd8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffffff8ccddb40 RCX: ffffffff893df4d5
RDX: 1ffffffff199bb7a RSI: ffffffff893df4f2 RDI: ffffffff8ccddbd0
RBP: ffffc90003f67c40 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000089 R12: ffff8880704f4e00
R13: 0000000000000040 R14: ffffc90003f67c68 R15: 0000000000000004
FS: 0000555568760500(0000) GS:ffff8881249e1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a42f56feb CR3: 0000000079bde000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
sock_read_iter+0x2b9/0x3b0 net/socket.c:1109
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0xaa3/0xc70 fs/read_write.c:570
ksys_read+0x205/0x240 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f525e58d33d
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 a8 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 01 72 1f 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffc03288098 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f525e58d33d
RDX: 0000000000000004 RSI: 00007ffc032880ac RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000032dc0 R09: 00007f525f497000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc032884c0
R13: 0000000000000004 R14: 00007ffc032880ac R15: 00007ffc03288140