INFO: task syz.4.1288:11366 blocked for more than 143 seconds.
Not tainted 6.12.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1288 state:D stack:27264 pid:11366 tgid:11365 ppid:5825 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0xe55/0x5740 kernel/sched/core.c:6690
__schedule_loop kernel/sched/core.c:6767 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6782
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839
rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1084
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0x124/0x330 kernel/locking/rwsem.c:1526
__super_lock fs/super.c:58 [inline]
super_lock+0x31a/0x3f0 fs/super.c:120
super_lock_shared fs/super.c:139 [inline]
iterate_supers+0xb9/0x240 fs/super.c:931
ksys_sync+0x8a/0x150 fs/sync.c:102
__do_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5fd777e719
RSP: 002b:00007f5fd84d7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f5fd7935f80 RCX: 00007f5fd777e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5fd77f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5fd7935f80 R15: 00007ffc0cd0cbb8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
2 locks held by kworker/u8:2/35:
3 locks held by kworker/u8:3/54:
2 locks held by getty/5588:
#0: ffff8880326570a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5836:
#0: ffff88806269e0e0 (&type->s_umount_key#80){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88806269e0e0 (&type->s_umount_key#80){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88806269e0e0 (&type->s_umount_key#80){++++}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:505
3 locks held by kworker/0:5/5878:
1 lock held by syz.4.1288/11366:
#0: ffff88806269e0e0 (&type->s_umount_key#80){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88806269e0e0 (&type->s_umount_key#80){++++}-{3:3}, at: super_lock+0x31a/0x3f0 fs/super.c:120
5 locks held by kworker/u8:4/12242:
2 locks held by syz-executor/12914:
#0: ffffffff8fee33e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fee33e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x372/0xea0 net/core/rtnetlink.c:6672
#1: ffffffff8e1c3c38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297
1 lock held by syz.6.1715/13176:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf0c/0x1240 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5814 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:rcu_cblist_dequeue+0x69/0xe0 kernel/rcu/rcu_segcblist.c:76
Code: f9 48 c1 e9 03 80 3c 11 00 75 6c 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 83 6b 10 01 48 c1 e9 03 80 3c 11 00 75 3e 48 8b 10 <48> 85 d2 48 89 13 74 0a 48 83 c4 08 5b c3 cc cc cc cc 48 8d 7b 08
RSP: 0018:ffffc90000a18e18 EFLAGS: 00000246
RAX: ffff88801eabed00 RBX: ffffc90000a18ea8 RCX: 1ffff11003d57da0
RDX: ffff88801eabed40 RSI: ffffffff8b6cd2a0 RDI: ffffc90000a18eb8
RBP: ffff8880b873fe40 R08: 0000000000000000 R09: fffffbfff20beb31
R10: ffffffff905f598f R11: 0000000000000000 R12: 0000000000000003
R13: ffffffff817530fb R14: 0000000000000000 R15: 0000000000000002
FS: 00005555566c9500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fb79f20300 CR3: 000000004dd2c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_do_batch kernel/rcu/tree.c:2555 [inline]
rcu_core+0x6fa/0x14d0 kernel/rcu/tree.c:2823
handle_softirqs+0x213/0x8f0 kernel/softirq.c:554
do_softirq kernel/softirq.c:455 [inline]
do_softirq+0xb2/0xf0 kernel/softirq.c:442
__local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382
tcp_recvmsg+0x139/0x680 net/ipv4/tcp.c:2852
inet_recvmsg+0x12b/0x6a0 net/ipv4/af_inet.c:885
sock_recvmsg_nosec net/socket.c:1051 [inline]
sock_recvmsg+0x1b2/0x250 net/socket.c:1073
sock_read_iter+0x2bb/0x3b0 net/socket.c:1143
new_sync_read fs/read_write.c:488 [inline]
vfs_read+0xa4c/0xbe0 fs/read_write.c:569
ksys_read+0x1fa/0x260 fs/read_write.c:712
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c6997d11d
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 78 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 21 04 19 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffdab87cb78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5c6997d11d
RDX: 0000000000000004 RSI: 00007ffdab87cb8c RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000002374a R09: 00007f5c6a747080
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdab87cfa0
R13: 0000000000000004 R14: 00007ffdab87cb8c R15: 00007ffdab87cc20