BUG: sleeping function called from invalid context at kernel/locking/mutex.c:908 in_atomic(): 1, irqs_disabled(): 0, pid: 8023, name: syz-executor.2 3 locks held by syz-executor.2/8023: #0: 00000000dd037883 (br_ioctl_mutex){+.+.}, at: sock_ioctl+0x2c6/0x610 net/socket.c:1039 #1: 0000000081716244 (rtnl_mutex){+.+.}, at: rtnl_lock_killable+0x17/0x20 net/core/rtnetlink.c:83 #2: 00000000d960df01 ((&sp->resync_t)){+.-.}, at: lockdep_copy_map include/linux/lockdep.h:168 [inline] #2: 00000000d960df01 ((&sp->resync_t)){+.-.}, at: call_timer_fn+0xda/0x720 kernel/time/timer.c:1316 Preemption disabled at: [] __do_softirq+0xf3/0x921 kernel/softirq.c:269 CPU: 1 PID: 8023 Comm: syz-executor.2 Not tainted 4.19.100-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 ___might_sleep.cold+0x1bd/0x1f6 kernel/sched/core.c:6192 __might_sleep+0x95/0x190 kernel/sched/core.c:6145 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0xc8/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 resync_tnc+0x1b6/0x320 drivers/net/hamradio/6pack.c:522 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:task_stack_page include/linux/sched/task_stack.h:21 [inline] RIP: 0010:last_frame arch/x86/kernel/unwind_frame.c:96 [inline] RIP: 0010:is_last_frame arch/x86/kernel/unwind_frame.c:101 [inline] RIP: 0010:is_last_task_frame arch/x86/kernel/unwind_frame.c:170 [inline] RIP: 0010:unwind_next_frame.part.0+0x118/0xa20 arch/x86/kernel/unwind_frame.c:294 Code: c1 ea 03 80 3c 02 00 0f 85 7c 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 53 28 48 8d 7a 18 48 89 fe 48 c1 ee 03 80 3c 06 00 <0f> 85 13 05 00 00 48 8b 42 18 48 8d b8 48 7f 00 00 4c 8d b8 58 7f RSP: 0018:ffff888042c1f210 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff888042c1f2e8 RCX: ffff888042c1f298 RDX: ffff88804d6c8440 RSI: 1ffff11009ad908b RDI: ffff88804d6c8458 RBP: ffff888042c1f2c0 R08: 0000000000000001 R09: ffff888042c1f340 R10: ffff888042c1f310 R11: ffff888042c1f320 R12: 1ffff11008583e47 R13: 0000000000000000 R14: ffff888042c1ff48 R15: ffff88812c31cdc0 unwind_next_frame+0x3b/0x50 arch/x86/kernel/unwind_frame.c:287 __save_stack_trace+0x83/0x100 arch/x86/kernel/stacktrace.c:44 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc_track_caller+0x159/0x750 mm/slab.c:3742 kmemdup+0x27/0x60 mm/util.c:118 kmemdup include/linux/string.h:421 [inline] __addrconf_sysctl_register+0xae/0x430 net/ipv6/addrconf.c:6554 addrconf_sysctl_register net/ipv6/addrconf.c:6619 [inline] addrconf_sysctl_register+0x140/0x1e0 net/ipv6/addrconf.c:6608 ipv6_add_dev net/ipv6/addrconf.c:446 [inline] ipv6_add_dev+0x9d0/0x10a0 net/ipv6/addrconf.c:366 addrconf_notify+0x960/0x2160 net/ipv6/addrconf.c:3437 notifier_call_chain+0xc2/0x230 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1748 call_netdevice_notifiers net/core/dev.c:1766 [inline] register_netdevice+0xa4d/0x1030 net/core/dev.c:8738 register_netdev+0x30/0x50 net/core/dev.c:8829 br_add_bridge+0xa4/0x100 net/bridge/br_if.c:461 br_ioctl_deviceless_stub+0x71a/0x7b0 net/bridge/br_ioctl.c:378 sock_ioctl+0x2ec/0x610 net/socket.c:1041 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fddb00c1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fddb00c26d4 RCX: 000000000045b349 RDX: 00000000200005c0 RSI: 00000000000089a0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006a9 R14: 00000000004c814c R15: 000000000075bf2c ================================ ------------[ cut here ]------------ WARNING: inconsistent lock state 4.19.100-syzkaller #0 Tainted: G W -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.2/8023 [HC0[0]:SC1[1]:HE1:SE0] takes: 000000002c3bdd42 (&tpk_port.port_write_mutex){+.?.}, at: tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 IRQs not enabled as expected tpk_write+0x5d/0x340 drivers/char/ttyprintk.c:123 tnc_init drivers/net/hamradio/6pack.c:536 [inline] sixpack_open+0x9d3/0xbf5 drivers/net/hamradio/6pack.c:632 tty_ldisc_open.isra.0+0x89/0xd0 drivers/tty/tty_ldisc.c:469 tty_set_ldisc+0x2d7/0x690 drivers/tty/tty_ldisc.c:594 WARNING: CPU: 0 PID: 3774 at fs/eventpoll.c:682 ep_scan_ready_list+0x81c/0xb20 fs/eventpoll.c:682 tiocsetd drivers/tty/tty_io.c:2359 [inline] tty_ioctl+0x65e/0x1510 drivers/tty/tty_io.c:2603