INFO: task syz-executor.0:6075 blocked for more than 143 seconds.
Not tainted 5.15.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:26592 pid: 6075 ppid: 5444 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
io_schedule+0x88/0x100 kernel/sched/core.c:8484
bit_wait_io+0xe/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb9/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x1d0/0x250 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
__wait_on_buffer fs/buffer.c:122 [inline]
wait_on_buffer include/linux/buffer_head.h:390 [inline]
__bread_slow fs/buffer.c:1181 [inline]
__bread_gfp+0x2d6/0x390 fs/buffer.c:1384
sb_bread include/linux/buffer_head.h:337 [inline]
isofs_fill_super+0xeb4/0x2930 fs/isofs/inode.c:673
mount_bdev+0x2c9/0x3f0 fs/super.c:1387
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1517
do_new_mount+0x2ba/0xb40 fs/namespace.c:3005
do_mount fs/namespace.c:3348 [inline]
__do_sys_mount fs/namespace.c:3556 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9a5bbe7ea9
RSP: 002b:00007f9a5a15a0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9a5bd15f80 RCX: 00007f9a5bbe7ea9
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00000000200000c0
RBP: 00007f9a5bc344a4 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000100c901 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9a5bd15f80 R15: 00007ffcac3acd58
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
4 locks held by kworker/u4:2/154:
#0: ffff888011dcd138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90001f07d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
#2: ffffffff8d9dbad0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf1/0xb60 net/core/net_namespace.c:558
#3: ffffffff8c923ff0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x9c/0x4e0 kernel/rcu/tree.c:4039
1 lock held by dhcpcd/3176:
#0: ffffffff8d9e7688 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2a5/0x1b20 net/ipv4/devinet.c:1066
2 locks held by getty/3272:
#0: ffff8880243c1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900024b32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
3 locks held by kworker/u4:11/3607:
#0: ffff8880b9a3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
#1: ffffc90003f77d20 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
#2: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
4 locks held by kworker/0:13/5780:
#0: ffff888011c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc900031a7d20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
#2: ffffffff8d9e7688 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
#3: ffffffff8c9240e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#3: ffffffff8c9240e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x280/0x740 kernel/rcu/tree_exp.h:845
1 lock held by syz-executor.0/6075:
#0: ffff88805fd2c0e0 (&type->s_umount_key#79/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
3 locks held by kworker/0:28/7701:
#0: ffff888011c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90002e47d20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
#2: ffffffff8c9240e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#2: ffffffff8c9240e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x350/0x740 kernel/rcu/tree_exp.h:845
2 locks held by kworker/0:30/7703:
#0: ffff888011c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc900032c7d20 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
1 lock held by syz-executor.3/7806:
1 lock held by syz-executor.0/8006:
#0: ffff88801b576208 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x146/0xe10 drivers/block/nbd.c:1460
1 lock held by syz-executor.0/8007:
#0: ffff88801b576208 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x146/0xe10 drivers/block/nbd.c:1460
1 lock held by syz-executor.0/8270:
#0: ffff88801b576208 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x146/0xe10 drivers/block/nbd.c:1460
2 locks held by syz-executor.0/8272:
#0: ffff888140847008 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x8b/0x3f0 fs/super.c:1354
#1: ffff88805fd2c0e0 (&type->s_umount_key#81){++++}-{3:3}, at: grab_super+0x59/0x1a0 fs/super.c:389
1 lock held by syz-executor.0/8273:
#0: ffff88801b576208 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x146/0xe10 drivers/block/nbd.c:1460
1 lock held by syz-executor.4/8371:
#0: ffffffff8d9e7688 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8d9e7688 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x94c/0xee0 net/core/rtnetlink.c:5626
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5374 Comm: syz-executor.2 Not tainted 5.15.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:check_preemption_disabled+0x63/0x110 lib/smp_processor_id.c:19
Code: 44 24 08 0f 85 c7 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e 41 5f c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <74> c9 49 89 f6 49 89 ff 65 4c 8b 25 dd bd e4 75 41 f6 44 24 2f 04
RSP: 0018:ffffc90002f37ba0 EFLAGS: 00000046
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffff88807dcf1dc0
RDX: 0000000000000000 RSI: ffffffff8a8b3c20 RDI: ffffffff8ad8f380
RBP: 0000000000000000 R08: ffffffff81b9b76c R09: ffffc90002f37e20
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000246
R13: ffff88807dcf1dc0 R14: 00000000ffffffff R15: ffffffff8c91fb80
FS: 0000555556860480(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33739000 CR3: 0000000064607000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:436 [inline]
lock_is_held_type+0xfd/0x180 kernel/locking/lockdep.c:5667
lock_is_held include/linux/lockdep.h:287 [inline]
___might_sleep+0xa2/0x6a0 kernel/sched/core.c:9592
__might_fault+0x6b/0x110 mm/memory.c:5325
rseq_get_rseq_cs kernel/rseq.c:131 [inline]
rseq_ip_fixup kernel/rseq.c:244 [inline]
__rseq_handle_notify_resume+0x11b/0x1250 kernel/rseq.c:292
rseq_handle_notify_resume include/linux/sched.h:2204 [inline]
tracehook_notify_resume include/linux/tracehook.h:201 [inline]
exit_to_user_mode_loop+0xdc/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb5288922b5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 b9 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f ba ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fffa2ad7d00 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 0000000000000203 RCX: 00007fb5288922b5
RDX: 00007fffa2ad7d40 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffa2ad7dcc R08: 0000000000000000 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000004df18 R14: 000000000004d56a R15: 0000000000000014