syzbot

INFO: task syz.4.1990:6447 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1990      state:D stack:0     pid:6447  tgid:6447  ppid:6391   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
 __schedule_loop kernel/sched/core.c:7945 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7960
 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x369/0x650 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 rcu_barrier+0x415/0x540 kernel/rcu/tree.c:4657
 kvm_mmu_uninit_tdp_mmu+0x1df/0x210 arch/x86/kvm/mmu/tdp_mmu.c:51
 kvm_mmu_uninit_vm+0x27/0x60 arch/x86/kvm/mmu/mmu.c:6572
 kvm_arch_destroy_vm+0x398/0x420 arch/x86/kvm/x86.c:12970
 kvm_destroy_vm virt/kvm/kvm_main.c:1355 [inline]
 kvm_put_kvm+0xb04/0x12c0 virt/kvm/kvm_main.c:1392
 kvm_vm_release+0x47/0x70 virt/kvm/kvm_main.c:1415
 __fput+0x1fb/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e8/0x260 kernel/task_work.c:246
 resume_user_mode_work+0x35/0x50 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x63/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f2b1899c799
RSP: 002b:00007ffde955a428 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffde955a510 RCX: 00007f2b1899c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000003a42a R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33220000 R11: 0000000000000246 R12: 00007ffde955a550
R13: 00007f2b18c1618c R14: 000000000003a4e6 R15: 00007f2b18c16180
 </TASK>
INFO: task syz.3.1993:6465 blocked for more than 125 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1993      state:D stack:0     pid:6465  tgid:6457  ppid:6196   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
 __schedule_loop kernel/sched/core.c:7945 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7960
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8017
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 do_ip_setsockopt+0x8e1/0x2a90 net/ipv4/ip_sockglue.c:1077
 ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
 udp_setsockopt+0xa3/0xc0 net/ipv4/udp.c:2875
 sock_common_setsockopt+0xb5/0xd0 net/core/sock.c:3858
 do_sock_setsockopt+0x27c/0x410 net/socket.c:2336
 __sys_setsockopt net/socket.c:2359 [inline]
 __do_sys_setsockopt net/socket.c:2368 [inline]
 __se_sys_setsockopt net/socket.c:2365 [inline]
 __x64_sys_setsockopt+0x1b7/0x250 net/socket.c:2365
 x64_sys_call+0x2adc/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4fe119c799
RSP: 002b:00007f4fdfbf7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f4fe1415fa0 RCX: 00007f4fe119c799
RDX: 000000000000002e RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f4fe1232c99 R08: 0000000000000108 R09: 0000000000000000
R10: 0000200000008500 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4fe1416038 R14: 00007f4fe1415fa0 R15: 00007fffea002968
 </TASK>
INFO: task syz.3.1993:6466 blocked for more than 131 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1993      state:D stack:0     pid:6466  tgid:6457  ppid:6196   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
 __schedule_loop kernel/sched/core.c:7945 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7960
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8017
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 do_ip_setsockopt+0x8e1/0x2a90 net/ipv4/ip_sockglue.c:1077
 ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
 udp_setsockopt+0xa3/0xc0 net/ipv4/udp.c:2875
 sock_common_setsockopt+0xb5/0xd0 net/core/sock.c:3858
 do_sock_setsockopt+0x27c/0x410 net/socket.c:2336
 __sys_setsockopt net/socket.c:2359 [inline]
 __do_sys_setsockopt net/socket.c:2368 [inline]
 __se_sys_setsockopt net/socket.c:2365 [inline]
 __x64_sys_setsockopt+0x1b7/0x250 net/socket.c:2365
 x64_sys_call+0x2adc/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4fe119c799
RSP: 002b:00007f4fdfbd6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f4fe1416090 RCX: 00007f4fe119c799
RDX: 0000000000000024 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f4fe1232c99 R08: 0000000000000008 R09: 0000000000000000
R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4fe1416128 R14: 00007f4fe1416090 R15: 00007fffea002968
 </TASK>
INFO: task syz.2.1994:6461 blocked for more than 132 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1994      state:D stack:0     pid:6461  tgid:6460  ppid:291    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
 __schedule_loop kernel/sched/core.c:7945 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7960
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8017
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rcu_barrier+0x4d/0x540 kernel/rcu/tree.c:4589
 br_multicast_dev_del+0x5b0/0x610 net/bridge/br_multicast.c:4470
 br_dev_uninit+0x20/0x40 net/bridge/br_device.c:155
 unregister_netdevice_many_notify+0x15c9/0x1c30 net/core/dev.c:11530
 unregister_netdevice_many net/core/dev.c:11570 [inline]
 unregister_netdevice_queue+0x341/0x390 net/core/dev.c:11444
 br_dev_delete+0x100/0x130 net/bridge/br_if.c:397
 br_del_bridge+0xbb/0xf0 net/bridge/br_if.c:496
 old_deviceless net/bridge/br_ioctl.c:390 [inline]
 br_ioctl_stub+0xa76/0xcd0 net/bridge/br_ioctl.c:423