INFO: task syz-executor324:6054 blocked for more than 143 seconds.
Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:27384 pid:6054 ppid:3620 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common+0x1be/0x530 kernel/sched/completion.c:106
__flush_work+0x58d/0xae0 kernel/workqueue.c:3073
__cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3160
p9_conn_destroy net/9p/trans_fd.c:890 [inline]
p9_fd_close+0x328/0x580 net/9p/trans_fd.c:920
p9_client_destroy+0xbe/0x370 net/9p/client.c:1018
v9fs_session_init+0x1003/0x1810 fs/9p/v9fs.c:488
v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1530
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x1326/0x1e20 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc7c17a3969
RSP: 002b:00007fc7c1750208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc7c18284c8 RCX: 00007fc7c17a3969
RDX: 00000000200001c0 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc7c18284c0 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7c18284cc
R13: 00007ffd29935d9f R14: 00007fc7c1750300 R15: 0000000000022000
INFO: task syz-executor324:6059 blocked for more than 143 seconds.
Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:27384 pid:6059 ppid:3619 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common+0x1be/0x530 kernel/sched/completion.c:106
__flush_work+0x58d/0xae0 kernel/workqueue.c:3073
__cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3160
p9_conn_destroy net/9p/trans_fd.c:890 [inline]
p9_fd_close+0x328/0x580 net/9p/trans_fd.c:920
p9_client_destroy+0xbe/0x370 net/9p/client.c:1018
v9fs_session_init+0x1003/0x1810 fs/9p/v9fs.c:488
v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1530
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x1326/0x1e20 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc7c17a3969
RSP: 002b:00007fc7c1750208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc7c18284c8 RCX: 00007fc7c17a3969
RDX: 00000000200001c0 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc7c18284c0 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7c18284cc
R13: 00007ffd29935d9f R14: 00007fc7c1750300 R15: 0000000000022000
INFO: task syz-executor324:6061 blocked for more than 144 seconds.
Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:27384 pid:6061 ppid:3624 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common+0x1be/0x530 kernel/sched/completion.c:106
__flush_work+0x58d/0xae0 kernel/workqueue.c:3073
__cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3160
p9_conn_destroy net/9p/trans_fd.c:890 [inline]
p9_fd_close+0x328/0x580 net/9p/trans_fd.c:920
p9_client_destroy+0xbe/0x370 net/9p/client.c:1018
v9fs_session_init+0x1003/0x1810 fs/9p/v9fs.c:488
v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1530
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x1326/0x1e20 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc7c17a3969
RSP: 002b:00007fc7c1750208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc7c18284c8 RCX: 00007fc7c17a3969
RDX: 00000000200001c0 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc7c18284c0 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7c18284cc
R13: 00007ffd29935d9f R14: 00007fc7c1750300 R15: 0000000000022000
Showing all threads with locks held in the system:
task:kworker/0:0 state:S stack:28512 pid:6 ppid:2 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
pipe_write+0xd08/0x1be0 fs/pipe.c:571
__kernel_write+0x2c6/0x7c0 fs/read_write.c:523
kernel_write fs/read_write.c:552 [inline]
kernel_write+0xe2/0x540 fs/read_write.c:542
p9_fd_write net/9p/trans_fd.c:429 [inline]
p9_write_work+0x25e/0xce0 net/9p/trans_fd.c:480
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
2 locks held by kworker/0:0/6:
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
#1: ffffc900000b7da8 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
task:rcu_tasks_kthre state:I stack:29096 pid:12 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
rcu_tasks_one_gp+0x3e5/0xc70 kernel/rcu/tasks.h:514
rcu_tasks_kthread+0x73/0xa0 kernel/rcu/tasks.h:552
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8bf88f30 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
task:rcu_tasks_trace state:I stack:29120 pid:13 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
rcu_tasks_one_gp+0x3e5/0xc70 kernel/rcu/tasks.h:514
rcu_tasks_kthread+0x73/0xa0 kernel/rcu/tasks.h:552
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8bf88c30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
task:kworker/0:1 state:S stack:26016 pid:14 ppid:2 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
pipe_write+0xd08/0x1be0 fs/pipe.c:571
__kernel_write+0x2c6/0x7c0 fs/read_write.c:523
kernel_write fs/read_write.c:552 [inline]
kernel_write+0xe2/0x540 fs/read_write.c:542
p9_fd_write net/9p/trans_fd.c:429 [inline]
p9_write_work+0x25e/0xce0 net/9p/trans_fd.c:480
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
2 locks held by kworker/0:1/14:
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
#1: ffffc90000137da8 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
task:kworker/0:2 state:S stack:28208 pid:143 ppid:2 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
pipe_write+0xd08/0x1be0 fs/pipe.c:571
__kernel_write+0x2c6/0x7c0 fs/read_write.c:523
kernel_write fs/read_write.c:552 [inline]
kernel_write+0xe2/0x540 fs/read_write.c:542
p9_fd_write net/9p/trans_fd.c:429 [inline]
p9_write_work+0x25e/0xce0 net/9p/trans_fd.c:480
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
2 locks held by kworker/0:2/143:
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
#1: ffffc900029efda8 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
task:kworker/0:3 state:S stack:27352 pid:2991 ppid:2 flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
pipe_write+0xd08/0x1be0 fs/pipe.c:571
__kernel_write+0x2c6/0x7c0 fs/read_write.c:523
kernel_write fs/read_write.c:552 [inline]
kernel_write+0xe2/0x540 fs/read_write.c:542
p9_fd_write net/9p/trans_fd.c:429 [inline]
p9_write_work+0x25e/0xce0 net/9p/trans_fd.c:480
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
2 locks held by kworker/0:3/2991:
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888011864d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
#1: ffffc90002e8fda8 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
task:getty state:S stack:23392 pid:3293 ppid:1 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911
wait_woken+0x18b/0x1f0 kernel/sched/wait.c:459
n_tty_read+0x1051/0x13e0 drivers/tty/n_tty.c:2243
iterate_tty_read drivers/tty/tty_io.c:858 [inline]
tty_read+0x33a/0x5d0 drivers/tty/tty_io.c:933
call_read_iter include/linux/fs.h:2182 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x67d/0x930 fs/read_write.c:470
ksys_read+0x127/0x250 fs/read_write.c:607
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fcbc084f8fe
RSP: 002b:00007fffb1bed018 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005560ed3b1910 RCX: 00007fcbc084f8fe
RDX: 0000000000000001 RSI: 00007fffb1bed030 RDI: 0000000000000000
RBP: 00005560ed3b1970 R08: 0000000000000007 R09: 00005560ed3b2cd0
R10: 0000000000000063 R11: 0000000000000246 R12: 00005560ed3b19ac
R13: 00007fffb1bed030 R14: 0000000000000000 R15: 00005560ed3b19ac
2 locks held by getty/3293:
#0: ffff88814b0bd098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc90002d232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef0/0x13e0 drivers/tty/n_tty.c:2177
task:kworker/0:6 state:D stack:29240 pid:8727 ppid:2 flags:0x00004000
Workqueue: rcu_gp wait_rcu_exp_gp
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
synchronize_rcu_expedited_wait_once kernel/rcu/tree_exp.h:571 [inline]
synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:622 [inline]
rcu_exp_wait_wake+0x28f/0xf80 kernel/rcu/tree_exp.h:688
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
2 locks held by kworker/0:6/8727:
#0: ffff888011866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888011866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888011866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888011866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888011866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888011866538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
#1: ffffc9000c1e7da8 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
task:syz-executor324 state:D stack:27384 pid:8961 ppid:3617 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
synchronize_rcu_expedited+0x39a/0x670 kernel/rcu/tree_exp.h:955
bdi_remove_from_list mm/backing-dev.c:928 [inline]
bdi_unregister+0x177/0x600 mm/backing-dev.c:936
generic_shutdown_super+0x331/0x400 fs/super.c:506
kill_anon_super+0x36/0x60 fs/super.c:1085
v9fs_kill_super+0x39/0x90 fs/9p/vfs_super.c:223
deactivate_locked_super+0x94/0x160 fs/super.c:332
v9fs_mount+0x7d4/0xc90 fs/9p/vfs_super.c:207
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1530
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x1326/0x1e20 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc7c17a3969
RSP: 002b:00007fc7c1750208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc7c18284c8 RCX: 00007fc7c17a3969
RDX: 00000000200001c0 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc7c18284c0 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7c18284cc
R13: 00007ffd29935d9f R14: 00007fc7c1750300 R15: 0000000000022000
1 lock held by syz-executor324/8961:
#0: ffffffff8bf94738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8bf94738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x562/0x670 kernel/rcu/tree_exp.h:940
task:syz-executor324 state:D stack:27456 pid:8960 ppid:3618 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5197 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6509
schedule+0xda/0x1b0 kernel/sched/core.c:6585
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6644
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa44/0x1350 kernel/locking/mutex.c:747
exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
synchronize_rcu_expedited+0x24a/0x670 kernel/rcu/tree_exp.h:940
bdi_remove_from_list mm/backing-dev.c:928 [inline]
bdi_unregister+0x177/0x600 mm/backing-dev.c:936
generic_shutdown_super+0x331/0x400 fs/super.c:506
kill_anon_super+0x36/0x60 fs/super.c:1085
v9fs_kill_super+0x39/0x90 fs/9p/vfs_super.c:223
deactivate_locked_super+0x94/0x160 fs/super.c:332
v9fs_mount+0x7d4/0xc90 fs/9p/vfs_super.c:207
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1530
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x1326/0x1e20 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc7c17a3969
RSP: 002b:00007fc7c1750208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc7c18284c8 RCX: 00007fc7c17a3969
RDX: 00000000200001c0 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fc7c18284c0 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7c18284cc
R13: 00007ffd29935d9f R14: 00007fc7c1750300 R15: 0000000000022000
1 lock held by syz-executor324/8960:
#0: ffffffff8bf94738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#0: ffffffff8bf94738 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x24a/0x670 kernel/rcu/tree_exp.h:940
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
khungtaskd[28] cmdline: a
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
__dump_stack lib/dump_stack.c:122 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:140
nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:227 [inline]
watchdog+0xcf7/0xfd0 kernel/hung_task.c:384
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 90 Comm: kworker/u4:4 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0
kworker/u4:4[90] cmdline: y yR
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4300 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0xa1/0x400 kernel/locking/lockdep.c:4271
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 1e 02 00 00 <44> 8b 05 c8 e8 bb 0f 45 85 c0 0f 84 e3 00 00 00 65 48 8b 1c 25 80
RSP: 0018:ffffc90001ecf9a0 EFLAGS: 00000097
RAX: 0000000000000003 RBX: ffffffff911b08c0 RCX: 1ffffffff1bbde09
RDX: 0000000000000004 RSI: ffffffff8f4f273a RDI: ffffffff81c83e2e
RBP: ffff888015b08558 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff812c588e
R13: 0000000000000001 R14: 0000000000000e2f R15: ffffffff8c0cd040
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000000bc8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_hardirqs_on+0x2d/0x120 kernel/trace/trace_preemptirq.c:49
__text_poke+0x64e/0x8e0 arch/x86/kernel/alternative.c:1183
text_poke arch/x86/kernel/alternative.c:1208 [inline]
text_poke_bp_batch+0x44a/0x6c0 arch/x86/kernel/alternative.c:1554
text_poke_flush arch/x86/kernel/alternative.c:1660 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1657 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x32f/0x410 kernel/jump_label.c:801
static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate mm/kfence/core.c:811 [inline]
toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:803
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306