INFO: task syz.6.8849:5925 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.8849 state:D stack:28760 pid:5925 tgid:5921 ppid:29356 task_flags:0x400040 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
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7f7/0x1550 kernel/locking/mutex.c:820
blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:561
sg_ioctl_common drivers/scsi/sg.c:1124 [inline]
sg_ioctl+0x45b/0x2220 drivers/scsi/sg.c:1158
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
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: 0033:0x7ff455d9ce59
RSP: 002b:00007ff456ca1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff456016180 RCX: 00007ff455d9ce59
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000007
RBP: 00007ff455e32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff456016218 R14: 00007ff456016180 R15: 00007ff45613fa48
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#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
2 locks held by getty/5382:
#0: ffff8880324200a0 (&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
5 locks held by kworker/u8:16/1207:
3 locks held by kworker/u8:23/1214:
3 locks held by syz.6.8849/5924:
1 lock held by syz.6.8849/5925:
#0: ffff8880267b4088 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_debugfs_lock_nomemsave block/blk.h:758 [inline]
#0: ffff8880267b4088 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:561
10 locks held by kworker/u8:2/6823:
1 lock held by rm/7249:
=============================================
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 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: 5924 Comm: syz.6.8849 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:filter_irq_stacks+0x88/0xa0 kernel/stacktrace.c:403
Code: c1 48 3d 4b 0c ac 8b 0f 93 c0 08 c8 74 11 48 ff c3 49 83 c7 08 49 39 dc 75 ae 44 89 e3 eb 06 ff c3 eb 02 31 db 89 d8 5b 41 5c <41> 5d 41 5e 41 5f c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 0018:ffffc9000499f7a8 EFLAGS: 00000246
RAX: 0000000000000009 RBX: ffff88802926c300 RCX: 0000000000000001
RDX: 0000000000002001 RSI: 0000000000000009 RDI: ffffc9000499f860
RBP: ffffc9000499f950 R08: ffffffff81d5b7f6 R09: ffffffff8e95cca0
R10: ffffc9000499f738 R11: ffffffff81b0f020 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffc9000499f860 R15: ffffc9000499f8a8
FS: 00007ff456cc26c0(0000) GS:ffff888125389000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7490619286 CR3: 00000000400d8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 08c5d32ffc85c5bc
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
stack_depot_save_flags+0x33/0x810 lib/stackdepot.c:667
save_stack+0x130/0x230 mm/page_owner.c:166
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943
relay_destroy_buf+0x10e/0x3a0 kernel/relay.c:199
relay_remove_buf kernel/relay.c:219 [inline]
kref_put include/linux/kref.h:65 [inline]
relay_close_buf kernel/relay.c:434 [inline]
relay_open+0x734/0x920 kernel/relay.c:530
blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:715
blk_trace_setup+0x2f8/0x520 kernel/trace/blktrace.c:789
sg_ioctl_common drivers/scsi/sg.c:1116 [inline]
sg_ioctl+0xa93/0x2220 drivers/scsi/sg.c:1158
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
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: 0033:0x7ff455d9ce59
Code: Unable to access opcode bytes at 0x7ff455d9ce2f.
RSP: 002b:00007ff456cc2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff456016090 RCX: 00007ff455d9ce59
RDX: 0000200000000580 RSI: 00000000c0481273 RDI: 0000000000000007
RBP: 00007ff455e32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff456016128 R14: 00007ff456016090 R15: 00007ff45613fa48