INFO: task syz-executor.3:7996 blocked for more than 143 seconds.
Not tainted 6.3.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3 state:D stack:21768 pid:7996 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5307 [inline]
__schedule+0x173b/0x4630 kernel/sched/core.c:6625
schedule+0xc3/0x180 kernel/sched/core.c:6701
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6760
rwsem_down_write_slowpath+0xedd/0x13a0 kernel/locking/rwsem.c:1178
__down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
unregister_netdevice_notifier+0x92/0x400 net/core/dev.c:1759
devlink_free+0x279/0x430 net/devlink/core.c:269
nsim_drv_remove+0x139/0x160 drivers/net/netdevsim/dev.c:1687
device_remove drivers/base/dd.c:540 [inline]
__device_release_driver drivers/base/dd.c:1240 [inline]
device_release_driver_internal+0x4a5/0x7a0 drivers/base/dd.c:1263
bus_remove_device+0x341/0x410 drivers/base/bus.c:574
device_del+0x681/0xb10 drivers/base/core.c:3775
device_unregister+0x20/0xc0 drivers/base/core.c:3805
nsim_bus_dev_del drivers/net/netdevsim/bus.c:310 [inline]
del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:219
kernfs_fop_write_iter+0x3a6/0x4f0 fs/kernfs/file.c:334
call_write_iter include/linux/fs.h:1851 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x7b2/0xbb0 fs/read_write.c:584
ksys_write+0x1a0/0x2c0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f57c183deef
RSP: 002b:00007ffecf007ef0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f57c183deef
RDX: 0000000000000001 RSI: 00007ffecf007f40 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007ffecf007e90
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f57c18e78b6
R13: 00007ffecf007f40 R14: 0000000000000000 R15: 00007ffecf008610
INFO: task syz-executor.2:7999 blocked for more than 143 seconds.
Not tainted 6.3.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:21768 pid:7999 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5307 [inline]
__schedule+0x173b/0x4630 kernel/sched/core.c:6625
schedule+0xc3/0x180 kernel/sched/core.c:6701
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6760
__mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:209
kernfs_fop_write_iter+0x3a6/0x4f0 fs/kernfs/file.c:334
call_write_iter include/linux/fs.h:1851 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x7b2/0xbb0 fs/read_write.c:584
ksys_write+0x1a0/0x2c0 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa0f4a3deef
RSP: 002b:00007ffe2182ef30 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fa0f4a3deef
RDX: 0000000000000001 RSI: 00007ffe2182ef80 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007ffe2182eed0
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fa0f4ae78b6
R13: 00007ffe2182ef80 R14: 0000000000000000 R15: 00007ffe2182f650
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cf25570 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cf25d70 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
#0: ffffffff8cf253a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4740:
#0: ffff88814a686098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2177
2 locks held by kworker/u4:17/7184:
3 locks held by kworker/u4:8/29126:
#0: ffff888016612938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2363
#1: ffffc90005b0fd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2365
#2: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf5/0xb80 net/core/net_namespace.c:575
6 locks held by syz-executor.3/7996:
#0: ffff888027e30460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x26d/0xbb0 fs/read_write.c:580
#1: ffff88807e144888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x4f0 fs/kernfs/file.c:325
#2: ffff888146cb43a8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x4f0 fs/kernfs/file.c:326
#3: ffffffff8d9fe988 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:209
#4: ffff888078ce10e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline]
#4: ffff888078ce10e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1063 [inline]
#4: ffff888078ce10e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7a0 drivers/base/dd.c:1260
#5: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: unregister_netdevice_notifier+0x92/0x400 net/core/dev.c:1759
4 locks held by syz-executor.2/7999:
#0: ffff888027e30460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x26d/0xbb0 fs/read_write.c:580
#1: ffff88802e6e4c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x4f0 fs/kernfs/file.c:325
#2: ffff888146cb43a8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x4f0 fs/kernfs/file.c:326
#3: ffffffff8d9fe988 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:209
4 locks held by syz-executor.1/8007:
#0: ffff888027e30460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x26d/0xbb0 fs/read_write.c:580
#1: ffff8880274cbc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x4f0 fs/kernfs/file.c:325
#2: ffff888146cb43a8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x4f0 fs/kernfs/file.c:326
#3: ffffffff8d9fe988 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:209
4 locks held by syz-executor.5/8016:
#0: ffff888027e30460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x26d/0xbb0 fs/read_write.c:580
#1: ffff88814a579888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x4f0 fs/kernfs/file.c:325
#2: ffff888146cb43a8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x4f0 fs/kernfs/file.c:326
#3: ffffffff8d9fe988 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:209
4 locks held by syz-executor.0/8019:
#0: ffff888027e30460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x26d/0xbb0 fs/read_write.c:580
#1: ffff88805b3b5c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x4f0 fs/kernfs/file.c:325
#2: ffff888146cb43a8 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x4f0 fs/kernfs/file.c:326
#3: ffffffff8d9fe988 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:209
1 lock held by syz-executor.3/8062:
#0: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4af/0x790 net/core/net_namespace.c:486
1 lock held by syz-executor.2/8065:
#0: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4af/0x790 net/core/net_namespace.c:486
1 lock held by syz-executor.1/8068:
#0: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4af/0x790 net/core/net_namespace.c:486
1 lock held by syz-executor.5/8071:
#0: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4af/0x790 net/core/net_namespace.c:486
1 lock held by syz-executor.0/8074:
#0: ffffffff8e07ab50 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4af/0x790 net/core/net_namespace.c:486
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xec2/0xf00 kernel/hung_task.c:379
kthread+0x270/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12876 Comm: kworker/u4:23 Not tainted 6.3.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_acquire+0x90/0x1f80
Code: c1 e8 03 80 3c 10 00 74 12 4c 89 f7 e8 c9 24 76 00 48 ba 00 00 00 00 00 fc ff df 48 c7 c0 c0 c0 19 90 49 39 06 75 03 45 31 ff <89> 5c 24 3c 83 fd 01 77 2e 89 e8 49 8d 5c c6 08 48 89 d8 48 c1 e8
RSP: 0018:ffffc9000332f900 EFLAGS: 00000006
RAX: ffffffff9019c0c0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880567a4258
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff88802847d7c0 R14: ffff8880567a4258 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f29a6575a00 CR3: 0000000026a76000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:355 [inline]
batadv_nc_purge_paths+0xe8/0x3a0 net/batman-adv/network-coding.c:442
batadv_nc_worker+0x2d3/0x5c0 net/batman-adv/network-coding.c:720
process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2390
worker_thread+0xa63/0x1210 kernel/workqueue.c:2537
kthread+0x270/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308