INFO: task syz.6.2684:12308 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2684 state:D stack:25104 pid:12308 ppid:8192 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
io_schedule+0x7c/0xd0 kernel/sched/core.c:8798
folio_wait_bit_common+0x70a/0xfa0 mm/filemap.c:1324
lock_page include/linux/pagemap.h:997 [inline]
pickup_page_for_submission fs/erofs/zdata.c:1330 [inline]
z_erofs_submit_queue fs/erofs/zdata.c:1522 [inline]
z_erofs_runqueue+0x8fe/0x1c60 fs/erofs/zdata.c:1594
z_erofs_readahead+0xa55/0xdd0 fs/erofs/zdata.c:1733
read_pages+0x185/0x850 mm/readahead.c:161
page_cache_ra_unbounded+0x690/0x770 mm/readahead.c:270
do_page_cache_ra mm/readahead.c:300 [inline]
force_page_cache_ra+0x2bd/0x320 mm/readahead.c:331
force_page_cache_readahead mm/internal.h:125 [inline]
generic_fadvise+0x47a/0x720 mm/fadvise.c:107
vfs_fadvise mm/fadvise.c:185 [inline]
ksys_fadvise64_64 mm/fadvise.c:199 [inline]
__do_sys_fadvise64 mm/fadvise.c:214 [inline]
__se_sys_fadvise64 mm/fadvise.c:212 [inline]
__x64_sys_fadvise64+0x139/0x180 mm/fadvise.c:212
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f431bd9aeb9
RSP: 002b:00007f431cb8f028 EFLAGS: 00000246 ORIG_RAX: 00000000000000dd
RAX: ffffffffffffffda RBX: 00007f431c016090 RCX: 00007f431bd9aeb9
RDX: 000000000000ff3a RSI: 000000000000aa1f RDI: 0000000000000004
RBP: 00007f431be08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f431c016128 R14: 00007f431c016090 R15: 00007fffcd156228
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cb2dfb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2e7d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4029:
#0: ffff88814d533098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x429/0x1390 drivers/tty/n_tty.c:2198
3 locks held by kworker/u4:6/4340:
2 locks held by kworker/0:5/4346:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc90004517d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
1 lock held by syz.6.2684/12308:
#0: ffff888072e60de8 (mapping.invalidate_lock#4){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline]
#0: ffff888072e60de8 (mapping.invalidate_lock#4){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xd8/0x770 mm/readahead.c:226
3 locks held by kworker/0:9/12786:
#0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffff8880b8e27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x398/0x6d0 kernel/sched/psi.c:999
#2: ffffffff8d1b7df8 (pool_lock){-.-.}-{2:2}, at: free_obj_work+0xea/0x5a0 lib/debugobjects.c:294
4 locks held by kworker/u4:10/13153:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc90003a97d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#2: ffffffff8dd45ba8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
#3: ffffffff8cb332f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#3: ffffffff8cb332f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
2 locks held by syz-executor/13642:
#0: ffffffff8dda5bb0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:860
#1: ffffffff8dd45ba8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5b/0x930 net/wireless/nl80211.c:16369
3 locks held by syz.3.3081/14104:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 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+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 32 Comm: kcompactd0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:fragmentation_score_zone_weighted mm/compaction.c:2011 [inline]
RIP: 0010:fragmentation_score_node mm/compaction.c:2030 [inline]
RIP: 0010:should_proactive_compact_node mm/compaction.c:2057 [inline]
RIP: 0010:kcompactd+0xcca/0x1fb0 mm/compaction.c:2967
Code: 01 00 00 42 80 3c 28 00 74 08 4c 89 e7 e8 8e 27 17 00 4d 8b 24 24 b8 70 4b 00 00 49 01 c4 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 e7 e8 6c 27 17 00 89 d8 4c 0f af f8 49 8b 0c 24 48 ff
RSP: 0018:ffffc90000a8fb40 EFLAGS: 00000246
RAX: 1ffff11027fffd6e RBX: 0000000000000019 RCX: 000000000004d616
RDX: 0000000000003872 RSI: 0000000000000009 RDI: ffff88813fffac48
RBP: ffffc90000a8ff00 R08: ffffc90000a8fac7 R09: 1ffff92000151f58
R10: dffffc0000000000 R11: fffff52000151f59 R12: ffff88813fffeb70
R13: dffffc0000000000 R14: 000000000000005a R15: 00000000000beffd
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005597ff9f7138 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295