INFO: task syz.3.469:8230 blocked for more than 143 seconds.
Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.469 state:D stack:22504 pid:8230 tgid:8227 ppid:5860 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
__lock_sock+0x1cf/0x340 net/core/sock.c:3139
lock_sock_nested+0x9e/0x100 net/core/sock.c:3707
lock_sock include/net/sock.h:1651 [inline]
sk_wait_data+0x345/0x520 net/core/sock.c:3211
tcp_recvmsg_locked+0xdfa/0x3ba0 net/ipv4/tcp.c:2727
tcp_recvmsg+0x222/0x8c0 net/ipv4/tcp.c:2878
inet_recvmsg+0x152/0x2d0 net/ipv4/af_inet.c:883
sock_recvmsg_nosec net/socket.c:1017 [inline]
sock_recvmsg+0x1ae/0x280 net/socket.c:1039
__sys_recvfrom+0x204/0x380 net/socket.c:2230
__do_sys_recvfrom net/socket.c:2245 [inline]
__se_sys_recvfrom net/socket.c:2241 [inline]
__x64_sys_recvfrom+0xde/0x100 net/socket.c:2241
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53a398e169
RSP: 002b:00007f53a4830038 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007f53a3bb6160 RCX: 00007f53a398e169
RDX: fffffffffffffd0b RSI: 0000200000000080 RDI: 0000000000000008
RBP: 00007f53a3a10a68 R08: 0000000000000000 R09: fffffffffffffd25
R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f53a3bb6160 R15: 00007f53a3cdfa28
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
2 locks held by kworker/u8:4/62:
#0: ffff8880b8639b18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:613
#1: ffff8880b8723b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41f/0x7a0 kernel/sched/psi.c:987
2 locks held by getty/5596:
#0: ffff888031d1d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036d62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
4 locks held by udevd/5839:
#0: ffff888052d96540 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb4/0xda0 fs/seq_file.c:182
#1: ffff88803567cc88 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154
#2: ffff88803429ee18 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155
#3: ffff8880273de198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff8880273de198 (&dev->mutex){....}-{4:4}, at: uevent_show+0x17d/0x340 drivers/base/core.c:2730
5 locks held by kworker/1:5/5897:
#0: ffff8880216d3148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff8880216d3148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000b527c60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000b527c60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffff888144b2d198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#2: ffff888144b2d198 (&dev->mutex){....}-{4:4}, at: hub_event+0x200/0x50f0 drivers/usb/core/hub.c:5859
#3: ffff8880273de198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff8880273de198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x90/0x530 drivers/base/dd.c:1005
#4: ffff88802877d160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#4: ffff88802877d160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x90/0x530 drivers/base/dd.c:1005
1 lock held by syz.3.469/8230:
#0: ffff88807d6edb98 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
#0: ffff88807d6edb98 (sk_lock-AF_INET){+.+.}-{0:0}, at: sk_wait_data+0x345/0x520 net/core/sock.c:3211
3 locks held by syz.3.469/8231:
1 lock held by syz.4.708/9520:
#0: ffffffff8ed43300 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3774
1 lock held by syz.2.709/9533:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5201 Comm: klogd Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:233 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4856 [inline]
RIP: 0010:__lock_acquire+0x36c/0xd80 kernel/locking/lockdep.c:5185
Code: 48 c7 c7 04 51 63 8e 48 c7 c6 fc b6 55 8e e8 3b a8 e3 ff 90 0f 0b 90 90 90 31 c0 48 8b 74 24 08 41 89 d8 0f b6 98 c4 00 00 00 <41> 8b 04 24 25 ff 1f 00 00 48 0f a3 05 33 89 d1 12 73 10 48 69 c0
RSP: 0018:ffffc90003ac6f60 EFLAGS: 00000006
RAX: ffffffff94111538 RBX: 0000000000000000 RCX: 000000000000000f
RDX: 0000000000000027 RSI: ffff88807f9528f0 RDI: 0000000000080000
RBP: ffff88807f951e00 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807f952988
R13: ffff88807f951e00 R14: 0000000000000000 R15: ffff88813fffbc58
FS: 00007f2b42ee0380(0000) GS:ffff888124f9a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005558abee8038 CR3: 000000002f664000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
seqcount_lockdep_reader_access+0xef/0x1e0 include/linux/seqlock.h:72
read_seqbegin include/linux/seqlock.h:836 [inline]
zone_span_seqbegin include/linux/memory_hotplug.h:103 [inline]
page_outside_zone_boundaries mm/page_alloc.c:441 [inline]
bad_range+0x5f/0x280 mm/page_alloc.c:460
__free_one_page+0x183/0xa50 mm/page_alloc.c:812
free_pcppages_bulk+0x3cf/0x5f0 mm/page_alloc.c:1355
free_frozen_page_commit+0x597/0x1150 mm/page_alloc.c:2699
__free_frozen_pages+0x808/0x10a0 mm/page_alloc.c:2753
discard_slab mm/slub.c:2730 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3199
put_cpu_partial+0x17e/0x250 mm/slub.c:3274
__slab_free+0x294/0x390 mm/slub.c:4526
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4161 [inline]
slab_alloc_node mm/slub.c:4210 [inline]
kmem_cache_alloc_node_noprof+0x1f2/0x3b0 mm/slub.c:4262
__alloc_skb+0x1c2/0x480 net/core/skbuff.c:658
alloc_skb include/linux/skbuff.h:1340 [inline]
alloc_skb_with_frags+0xc3/0x830 net/core/skbuff.c:6639
sock_alloc_send_pskb+0x91c/0xa70 net/core/sock.c:2954
unix_dgram_sendmsg+0x6d4/0x1ea0 net/unix/af_unix.c:2007
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:727
__sys_sendto+0x365/0x4c0 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b430429b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe96e3cb18 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f2b430429b5
RDX: 000000000000004c RSI: 00005558abee6030 RDI: 0000000000000003
RBP: 00005558abedf910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f2b431d0212 R14: 00007ffe96e3cc18 R15: 0000000000000000