INFO: task syz.3.1133:10515 blocked for more than 143 seconds.
      Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1133      state:D stack:27552 pid:10515 ppid:  8680 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
 __mutex_lock_common+0xc71/0x2390 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x108/0x4f0 kernel/trace/blktrace.c:735
 blkdev_common_ioctl+0xfbe/0x1c70 block/ioctl.c:532
 blkdev_ioctl+0x295/0x690 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2f93cd6b69
RSP: 002b:00007f2f91b1d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2f93efe080 RCX: 00007f2f93cd6b69
RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000003
RBP: 00007f2f93d59df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f2f93efe080 R15: 00007ffcd59b0278
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c11c360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:2/154:
 #0: ffff888016879138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffff8880b9127848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4d6/0x810 kernel/sched/psi.c:891
2 locks held by kswapd0/254:
2 locks held by kswapd1/255:
1 lock held by udevd/3560:
 #0: ffffffff8c1dc0c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
 #0: ffffffff8c1dc0c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
 #0: ffffffff8c1dc0c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0xf92/0x26e0 mm/page_alloc.c:5101
2 locks held by getty/3950:
 #0: ffff88814cbd7098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
2 locks held by kworker/u4:5/4269:
3 locks held by kworker/1:17/7260:
 #0: ffff888016870938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc9000342fd00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
 #2: ffffffff8c120de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #2: ffffffff8c120de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x347/0x6b0 kernel/rcu/tree_exp.h:845
2 locks held by kworker/1:23/9654:
 #0: ffff888016872138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc9000469fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
3 locks held by syz.3.1133/10510:
 #0: ffff8880205a5b88 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x108/0x4f0 kernel/trace/blktrace.c:735
 #1: ffffffff8c15a8e8 (relay_channels_mutex){+.+.}-{3:3}, at: relay_open+0x314/0x8e0 kernel/relay.c:518
 #2: ffffffff8c1dc0c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
 #2: ffffffff8c1dc0c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
 #2: ffffffff8c1dc0c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0xf92/0x26e0 mm/page_alloc.c:5101
1 lock held by syz.3.1133/10515:
 #0: ffff8880205a5b88 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x108/0x4f0 kernel/trace/blktrace.c:735
3 locks held by dhcpcd-run-hook/12875:
 #0: ffff888020a97a40 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1479 [inline]
 #0: ffff888020a97a40 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc4/0x17d0 fs/exec.c:1820
 #1: ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
 #2: ffff8880b9027848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4d6/0x810 kernel/sched/psi.c:891

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 254 Comm: kswapd0 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vma_start_pgoff mm/interval_tree.c:15 [inline]
RIP: 0010:vma_interval_tree_iter_next+0xfe/0x320 mm/interval_tree.c:23
Code: 83 12 00 4d 8d 65 a8 4d 8b 3f 4c 39 fd 75 07 e8 08 20 ce ff eb 9c 4c 89 74 24 08 49 8d 6d 40 48 89 e8 48 c1 e8 03 80 3c 18 00 <74> 08 48 89 ef e8 28 83 12 00 48 8b 6d 00 4c 8b 34 24 4c 89 f7 48
RSP: 0018:ffffc900021471e8 EFLAGS: 00000246
RAX: 1ffff11003f139c0 RBX: dffffc0000000000 RCX: ffff88801d8f0000
RDX: 0000000000000000 RSI: ffff88801f89cdc0 RDI: 0000000000000000
RBP: ffff88801f89ce00 R08: dffffc0000000000 R09: fffff940002a3e19
R10: fffff940002a3e19 R11: 1ffffd40002a3e18 R12: ffff88801f89cd68
R13: ffff88801f89cdc0 R14: 0000000000000167 R15: ffff88801ee9a370
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa694ade286 CR3: 000000000be8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rmap_walk_file+0x46a/0x610 mm/rmap.c:2368
 rmap_walk mm/rmap.c:2396 [inline]
 page_referenced+0x46a/0x590 mm/rmap.c:896
 shrink_active_list+0x4b6/0x1070 mm/vmscan.c:2335
 shrink_list mm/vmscan.c:2444 [inline]
 shrink_lruvec+0xc77/0x24a0 mm/vmscan.c:2769
 shrink_node_memcgs mm/vmscan.c:2956 [inline]
 shrink_node+0x10a7/0x2610 mm/vmscan.c:3079
 kswapd_shrink_node mm/vmscan.c:3821 [inline]
 balance_pgdat+0xe48/0x1980 mm/vmscan.c:4012
 kswapd+0x7b1/0xdb0 mm/vmscan.c:4271
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>