INFO: task syz.3.143:4916 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.143 state:D stack:25376 pid: 4916 ppid: 4190 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
wait_on_page_bit_common+0x8bf/0xeb0 mm/filemap.c:1356
lock_page include/linux/pagemap.h:625 [inline]
pickup_page_for_submission fs/erofs/zdata.c:1138 [inline]
z_erofs_submit_queue fs/erofs/zdata.c:1309 [inline]
z_erofs_runqueue+0x775/0x1a70 fs/erofs/zdata.c:1370
z_erofs_readahead+0xbc7/0x1140 fs/erofs/zdata.c:1462
read_pages+0x172/0x920 mm/readahead.c:130
page_cache_ra_unbounded+0x7f4/0x8f0 mm/readahead.c:239
do_page_cache_ra mm/readahead.c:269 [inline]
force_page_cache_ra+0x3e5/0x440 mm/readahead.c:301
force_page_cache_readahead mm/internal.h:78 [inline]
generic_fadvise+0x52b/0x7e0 mm/fadvise.c:107
vfs_fadvise mm/fadvise.c:186 [inline]
ksys_fadvise64_64 mm/fadvise.c:200 [inline]
__do_sys_fadvise64 mm/fadvise.c:215 [inline]
__se_sys_fadvise64 mm/fadvise.c:213 [inline]
__x64_sys_fadvise64+0x139/0x180 mm/fadvise.c:213
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: 0033:0x7f7776bd60d9
RSP: 002b:00007f7774e2e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000dd
RAX: ffffffffffffffda RBX: 00007f7776e5dfa0 RCX: 00007f7776bd60d9
RDX: 0000000000e10018 RSI: 0000000000e0ffff RDI: 0000000000000004
RBP: 00007f7776c6d024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7776e5e038 R14: 00007f7776e5dfa0 R15: 00007ffe14124608
Showing all locks held in the system:
3 locks held by kworker/1:0/21:
#0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc90000db7d00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8c3238f0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0xa1/0x4c0 kernel/rcu/tree.c:4043
1 lock held by khungtaskd/27:
#0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3941:
#0: ffff88814cf3d098 (&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+0x594/0x1a50 drivers/tty/n_tty.c:2158
1 lock held by syz.3.143/4916:
#0: ffff88805f388320 (mapping.invalidate_lock#6){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:842 [inline]
#0: ffff88805f388320 (mapping.invalidate_lock#6){.+.+}-{3:3}, at: page_cache_ra_unbounded+0x19a/0x8f0 mm/readahead.c:195
1 lock held by syz-executor/5101:
2 locks held by kworker/1:9/5198:
#0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000343fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
2 locks held by kworker/u4:22/5265:
#0: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x98/0x130 kernel/sched/core.c:483
#1: ffff8880b9127888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 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+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:get_partial mm/slub.c:2238 [inline]
RIP: 0010:___slab_alloc+0x5be/0xdd0 mm/slub.c:3008
Code: 07 65 8b 05 14 f1 45 7e 48 98 48 8b b4 c3 d0 00 00 00 48 89 df 48 8d 54 24 38 8b 4c 24 08 e8 d9 6a 00 00 49 89 c5 41 83 ff ff <0f> 85 16 02 00 00 4d 85 ed 0f 85 0d 02 00 00 f7 44 24 24 e8 e8 00
RSP: 0018:ffffc90000cc7a30 EFLAGS: 00000246
RAX: ffff88801dba8000 RBX: ffff888016c42140 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff901ee1bf R09: 1ffffffff203dc37
R10: dffffc0000000000 R11: fffffbfff203dc38 R12: 0000000000000000
R13: ffff88801dba8000 R14: ffffffff7fff0000 R15: 00000000ffffffff
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ab61052f8 CR3: 00000000496fb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node_track_caller+0x13d/0x3a0 mm/slub.c:4963
kmalloc_reserve net/core/skbuff.c:356 [inline]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
alloc_skb include/linux/skbuff.h:1162 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline]
nsim_dev_trap_report_work+0x25c/0xab0 drivers/net/netdevsim/dev.c:762
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287