INFO: task syz.2.22:4469 blocked for more than 143 seconds.
Not tainted 6.1.141-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.22 state:D stack:26000 pid:4469 ppid:4251 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
io_schedule+0x7c/0xd0 kernel/sched/core.c:8797
folio_wait_bit_common+0x6e1/0xf60 mm/filemap.c:1324
folio_put_wait_locked mm/filemap.c:1493 [inline]
do_read_cache_folio+0x1a9/0x760 mm/filemap.c:3609
erofs_bread+0x18e/0x670 fs/erofs/data.c:50
erofs_find_target_block fs/erofs/namei.c:102 [inline]
erofs_namei+0x28f/0xf00 fs/erofs/namei.c:175
erofs_lookup+0x14b/0x390 fs/erofs/namei.c:204
__lookup_slow+0x27d/0x3a0 fs/namei.c:1690
lookup_slow+0x53/0x70 fs/namei.c:1707
walk_component+0x2be/0x3f0 fs/namei.c:1998
lookup_last fs/namei.c:2455 [inline]
path_lookupat+0x169/0x440 fs/namei.c:2479
filename_lookup+0x1f0/0x500 fs/namei.c:2508
kern_path+0x31/0x50 fs/namei.c:2606
unix_find_bsd net/unix/af_unix.c:1039 [inline]
unix_find_other+0xf5/0x7f0 net/unix/af_unix.c:1100
unix_dgram_sendmsg+0x8e3/0x16c0 net/unix/af_unix.c:1962
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x59b/0x970 net/socket.c:2519
___sys_sendmsg+0x21c/0x290 net/socket.c:2573
__sys_sendmmsg+0x272/0x490 net/socket.c:2659
__do_sys_sendmmsg net/socket.c:2688 [inline]
__se_sys_sendmmsg net/socket.c:2685 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9ab758e929
RSP: 002b:00007f9ab8478038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f9ab77b6080 RCX: 00007f9ab758e929
RDX: 0000000000000002 RSI: 00002000000254c0 RDI: 0000000000000005
RBP: 00007f9ab7610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9ab77b6080 R15: 00007ffe322745b8
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c92b430 (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: ffffffff8c92bc50 (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: ffffffff8c92aaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8c92aaa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8c92aaa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4012:
#0: ffff88814d6da098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000326b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198
1 lock held by syz-executor/4256:
#0: ffffffff8c930778 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#0: ffffffff8c930778 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962
2 locks held by kworker/0:5/4301:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90003f37d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
1 lock held by syz.2.22/4466:
1 lock held by syz.2.22/4469:
#0: ffff888054680198 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
#0: ffff888054680198 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1706
1 lock held by syz.0.562/6252:
#0: ffffffff8c930640 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x600 kernel/rcu/tree.c:4019
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 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: 4466 Comm: syz.2.22 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65
Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01
RSP: 0018:ffffc900001e02e8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc900001e03c8 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc900001e0428
RBP: ffffffff8e7fd6ea R08: dffffc0000000000 R09: ffffc900001e0418
R10: fffff5200003c085 R11: 1ffff9200003c083 R12: 1ffff9200003c07a
R13: dffffc0000000000 R14: ffffc900001e0418 R15: ffffc900001e03fd
FS: 00007f9ab84996c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9d2f80ab8 CR3: 0000000074e7e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
unwind_next_frame+0xb8a/0x20b0 arch/x86/kernel/unwind_orc.c:546
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x14d/0x320 mm/slub.c:3443
__alloc_skb+0xfc/0x7e0 net/core/skbuff.c:505
__pskb_copy_fclone+0xa6/0x1010 net/core/skbuff.c:1771
__pskb_copy include/linux/skbuff.h:1335 [inline]
pskb_copy include/linux/skbuff.h:3544 [inline]
tipc_udp_send_msg+0x256/0x3e0 net/tipc/udp_media.c:265
tipc_bearer_xmit_skb+0x2a9/0x3f0 net/tipc/bearer.c:577
tipc_disc_timeout+0x568/0x6b0 net/tipc/discover.c:338
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1948 [inline]
RIP: 0010:vprintk_emit+0x461/0x680 kernel/printk/printk.c:2302
Code: 85 8f 01 00 00 e8 2f c8 1a 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 1e c8 1a 00 eb 06 e8 17 c8 1a 00 fb 48 c7 c7 20 ed 91 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 57 db
RSP: 0018:ffffc9000479efa0 EFLAGS: 00000246
RAX: ffffffff81660e59 RBX: ffffffff81660d05 RCX: 0000000000080000
RDX: ffffc9000d9c2000 RSI: 000000000007ffff RDI: ffffffff8c91ed20
RBP: ffffc9000479f090 R08: dffffc0000000000 R09: fffffbfff2117070
R10: fffffbfff2117070 R11: 1ffffffff211706f R12: dffffc0000000000
R13: 1ffff920008f3df8 R14: 0000000000000200 R15: 0000000000000057
_printk+0xcc/0x110 kernel/printk/printk.c:2328
_erofs_err+0x11f/0x170 fs/erofs/super.c:35
z_erofs_pcluster_readmore+0x330/0x480 fs/erofs/zdata.c:1678
z_erofs_read_folio+0x248/0x5c0 fs/erofs/zdata.c:1703
filemap_read_folio+0x160/0x760 mm/filemap.c:2490
do_read_cache_folio+0x2a0/0x760 mm/filemap.c:3627
erofs_bread+0x18e/0x670 fs/erofs/data.c:50
erofs_find_target_block fs/erofs/namei.c:102 [inline]
erofs_namei+0x28f/0xf00 fs/erofs/namei.c:175
erofs_lookup+0x14b/0x390 fs/erofs/namei.c:204
__lookup_slow+0x27d/0x3a0 fs/namei.c:1690
lookup_slow+0x53/0x70 fs/namei.c:1707
walk_component+0x2be/0x3f0 fs/namei.c:1998
lookup_last fs/namei.c:2455 [inline]
path_lookupat+0x169/0x440 fs/namei.c:2479
filename_lookup+0x1f0/0x500 fs/namei.c:2508
vfs_statx+0x109/0x650 fs/stat.c:229
vfs_fstatat fs/stat.c:267 [inline]
__do_sys_newfstatat fs/stat.c:437 [inline]
__se_sys_newfstatat fs/stat.c:431 [inline]
__x64_sys_newfstatat+0x155/0x1e0 fs/stat.c:431
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9ab758e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9ab8499038 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007f9ab77b5fa0 RCX: 00007f9ab758e929
RDX: 0000000000000000 RSI: 0000200000000200 RDI: ffffffffffffff9c
RBP: 00007f9ab7610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000006000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9ab77b5fa0 R15: 00007ffe322745b8