rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2650 jiffies s: 153393 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13431 Comm: syz.0.1956 Not tainted 6.10.0-rc5-next-20240624-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:delay_tsc+0x5c/0xe0 arch/x86/lib/delay.c:79 Code: 90 48 89 d5 48 c1 e5 20 48 09 c5 48 29 dd 4c 39 f5 73 67 bf 01 00 00 00 e8 91 cd d8 f5 65 8b 05 82 11 7a 74 85 c0 74 2f f3 90 01 00 00 00 e8 da cb d8 f5 e8 c5 f2 03 00 41 39 c7 75 20 0f 01 RSP: 0018:ffffc90000007298 EFLAGS: 00000002 RAX: 0000000000000102 RBX: 000001673d2963c5 RCX: 0000000000000103 RDX: 0000000000000167 RSI: ffffffff8c2074c0 RDI: 0000000000000001 RBP: 00000000000001ba R08: ffffffff853f5484 R09: 1ffff11003f3f046 R10: dffffc0000000000 R11: ffffffff8b89c3f0 R12: dffffc0000000000 R13: ffffffff9481ce30 R14: 0000000000000899 R15: 0000000000000000 FS: 00007f83151426c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f948b5ffd00 CR3: 0000000070f8a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: wait_for_lsr drivers/tty/serial/8250/8250_port.c:2074 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline] serial8250_console_write+0x1328/0x1ed0 drivers/tty/serial/8250/8250_port.c:3393 console_emit_next_record kernel/printk/printk.c:3030 [inline] console_flush_all+0x880/0xf50 kernel/printk/printk.c:3102 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3173 vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423 _printk+0xd5/0x120 kernel/printk/printk.c:2450 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline] show_trace_log_lvl+0x43a/0x520 arch/x86/kernel/dumpstack.c:285 sched_show_task+0x578/0x740 kernel/sched/core.c:7506 report_rtnl_holders+0x1ba/0x2d0 net/core/rtnetlink.c:104 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline] RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline] RIP: 0010:raw_atomic_long_read include/linux/atomic/atomic-long.h:38 [inline] RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:3189 [inline] RIP: 0010:__mutex_unlock_slowpath+0xfb/0x750 kernel/locking/mutex.c:921 Code: 24 88 00 00 00 49 8d 7e 68 4c 89 fe e8 1e 43 d8 f5 4c 89 f7 be 08 00 00 00 e8 41 d4 62 f6 4c 89 f0 48 c1 e8 03 48 89 44 24 28 <42> 80 3c 28 00 74 08 4c 89 f7 e8 b6 d1 62 f6 49 8b 1e 4d 89 e7 49 RSP: 0018:ffffc900108a7b40 EFLAGS: 00000a02 RAX: 1ffff1100f6a8408 RBX: ffffc900108a7bc0 RCX: ffffffff8b97432f RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88807b542040 RBP: ffffc900108a7c50 R08: ffff88807b542047 R09: 1ffff1100f6a8408 R10: dffffc0000000000 R11: ffffed100f6a8409 R12: ffffc900108a7be0 R13: dffffc0000000000 R14: ffff88807b542040 R15: ffffffff84a5ab7e io_cqring_do_overflow_flush io_uring/io_uring.c:641 [inline] io_cqring_wait io_uring/io_uring.c:2448 [inline] __do_sys_io_uring_enter io_uring/io_uring.c:3213 [inline] __se_sys_io_uring_enter+0x1b7e/0x2670 io_uring/io_uring.c:3105 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8314375ae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8315142048 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f8314503fa0 RCX: 00007f8314375ae9 RDX: 00000000000045d0 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007f83143f6746 R08: 0000000000000000 R09: 0000000001000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f8314503fa0 R15: 00007ffccfbe13f8 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 __tun_chr_ioctl+0x48f/0x2400 drivers/net/tun.c:3110 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa32e1756eb RSP: 002b:00007ffeee7e97c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa32e303f60 RCX: 00007fa32e1756eb RDX: 00007ffeee7e9840 RSI: 00000000400454ca RDI: 00000000000000c8 RBP: 00007fa32e3049f8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009 DEBUG: waiting rtnl_mutex for 5874 jiffies. task:syz-executor state:D stack:21024 pid:18258 tgid:18258 ppid:1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f82f5d7787c RSP: 002b:00007ffe07ffb910 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f82f6a34620 RCX: 00007f82f5d7787c RDX: 0000000000000020 RSI: 00007f82f6a34670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe07ffb964 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f82f6a34670 R15: 0000000000000000 DEBUG: waiting rtnl_mutex for 5915 jiffies. task:syz-executor state:D stack:21024 pid:17552 tgid:17552 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 unregister_netdevice_notifier_net+0x89/0x3a0 net/core/dev.c:1913 nsim_dev_hwstats_exit+0x81/0x290 drivers/net/netdevsim/hwstats.c:483 nsim_dev_reload_destroy+0x2ad/0x490 drivers/net/netdevsim/dev.c:1659 nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1673 device_remove drivers/base/dd.c:566 [inline] __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x4a9/0x7c0 drivers/base/dd.c:1295 bus_remove_device+0x34f/0x420 drivers/base/bus.c:574 device_del+0x57a/0x9b0 drivers/base/core.c:3868 device_unregister+0x20/0xc0 drivers/base/core.c:3909 nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline] del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:226 kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd1d117469f RSP: 002b:00007ffcc99f5c50 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fd1d117469f RDX: 0000000000000001 RSI: 00007ffcc99f5ca0 RDI: 0000000000000005 RBP: 00007fd1d11e44d1 R08: 0000000000000000 R09: 00007ffcc99f5aa7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffcc99f5ca0 R14: 00007fd1d1e34620 R15: 0000000000000003 DEBUG: waiting rtnl_mutex for 5943 jiffies. task:syz-executor state:D stack:24944 pid:19187 tgid:19187 ppid:19148 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efcf2f7787c RSP: 002b:00007ffddb2ce0c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007efcf3c34620 RCX: 00007efcf2f7787c RDX: 0000000000000028 RSI: 00007efcf3c34670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffddb2ce114 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007efcf3c34670 R15: 0000000000000000 DEBUG: waiting rtnl_mutex for 5974 jiffies. task:kworker/u8:12 state:D stack:20152 pid:2486 tgid:2486 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193 process_one_work kernel/workqueue.c:3224 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305 worker_thread+0x86d/0xd40 kernel/workqueue.c:3383 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 DEBUG: waiting rtnl_mutex for 5971 jiffies. task:kworker/0:5 state:D stack:22992 pid:5146 tgid:5146 ppid:2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 linkwatch_event+0xe/0x60 net/core/link_watch.c:276 process_one_work kernel/workqueue.c:3224 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305 worker_thread+0x86d/0xd40 kernel/workqueue.c:3383 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 DEBUG: waiting rtnl_mutex for 2947 jiffies. task:syz-executor state:D stack:24160 pid:19201 tgid:19201 ppid:19199 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f25dd37787c RSP: 002b:00007ffcafbf9560 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f25de034620 RCX: 00007f25dd37787c RDX: 0000000000000028 RSI: 00007f25de034670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffcafbf95b4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f25de034670 R15: 0000000000000000 DEBUG: waiting rtnl_mutex for 2977 jiffies. task:syz-executor state:D stack:24992 pid:19205 tgid:19205 ppid:19200 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597 __schedule_loop kernel/sched/core.c:6674 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6689 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6746 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f948cd7787c RSP: 002b:00007ffd60647dc0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f948da34620 RCX: 00007f948cd7787c RDX: 0000000000000028 RSI: 00007f948da34670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd60647e14 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f948da34670 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u8:3/52: 5 locks held by kworker/u8:11/2468: #0: ffff888015edd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3199 [inline] #0: ffff888015edd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305 #1: ffffc90009287d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3200 [inline] #1: ffffc90009287d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305 #2: ffffffff8f5ec210 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594 #3: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xa90 net/core/dev.c:11796 #4: ffffffff8e33a9f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #4: ffffffff8e33a9f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:959 3 locks held by kworker/u8:12/2486: #0: ffff88802a225948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3199 [inline] #0: ffff88802a225948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305 #1: ffffc90009357d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3200 [inline] #1: ffffc90009357d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305 #2: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193 2 locks held by getty/4857: #0: ffff88802ae410a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:5/5146: #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3199 [inline] #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305 #1: ffffc90003fc7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3200 [inline] #1: ffffc90003fc7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305 #2: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 3 locks held by kworker/1:6/5151: #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3199 [inline] #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305 #1: ffffc90004157d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3200 [inline] #1: ffffc90004157d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305 #2: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 1 lock held by syz.4.1845/12553: 3 locks held by syz.0.1956/13431: #0: ffffc90000007c00 (net/core/rtnetlink.c:82){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1789 #1: ffffffff8e335620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline] #1: ffffffff8e335620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:845 [inline] #1: ffffffff8e335620 (rcu_read_lock){....}-{1:2}, at: report_rtnl_holders+0x20/0x2d0 net/core/rtnetlink.c:95 #2: ffffffff8e335620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline] #2: ffffffff8e335620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:845 [inline] #2: ffffffff8e335620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6688 2 locks held by kworker/u8:7/16583: 4 locks held by syz-executor/17544: #0: ffff88801dc88420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline] #0: ffff88801dc88420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586 #1: ffff88802f659088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325 #2: ffff888021737e18 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326 #3: ffffffff8ef04e28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 7 locks held by syz-executor/17552: #0: ffff88801dc88420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline] #0: ffff88801dc88420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586 #1: ffff88802da67088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325 #2: ffff888021737e18 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326 #3: ffffffff8ef04e28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 #4: ffff88804bc8c0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff88804bc8c0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff88804bc8c0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292 #5: ffff88804bc8a250 (&devlink->lock_key#38){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672 #6: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: unregister_netdevice_notifier_net+0x89/0x3a0 net/core/dev.c:1913 4 locks held by syz-executor/17558: #0: ffff88801dc88420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline] #0: ffff88801dc88420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586 #1: ffff88802d8c7088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325 #2: ffff888021737e18 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326 #3: ffffffff8ef04e28 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 1 lock held by syz-executor/18258: #0: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 1 lock held by syz-executor/18979: #0: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48f/0x2400 drivers/net/tun.c:3110 1 lock held by syz-executor/19187: #0: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 1 lock held by syz-executor/19201: #0: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 1 lock held by syz-executor/19205: #0: ffffffff8f5f8ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x839/0x1170 net/core/rtnetlink.c:6723 =============================================