Hello, syzbot found the following issue on: HEAD commit: 95aafe91 net: ethernet: ixp4xx: Support device tree probing git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14fad3e1d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7668018815a66138 dashboard link: https://syzkaller.appspot.com/bug?extid=7d941e89dd48bcf42573 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103edf15d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1592b9d5d00000 The issue was bisected to: commit f185de28d9ae6c978135993769352e523ee8df06 Author: Taehee Yoo <ap420073@xxxxxxxxx> Date: Thu Mar 25 16:16:56 2021 +0000 mld: add new workqueues for process mld events bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=145ba3f5d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=165ba3f5d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=125ba3f5d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7d941e89dd48bcf42573@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: f185de28d9ae ("mld: add new workqueues for process mld events") BUG: sleeping function called from invalid context at kernel/locking/mutex.c:928 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 9825, name: syz-executor943 2 locks held by syz-executor943/9825: #0: ffffffff8d6730a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d6730a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5559 #1: ffffffff8bf74520 (rcu_read_lock){....}-{1:2}, at: nla_ok include/net/netlink.h:1159 [inline] #1: ffffffff8bf74520 (rcu_read_lock){....}-{1:2}, at: do_setlink+0x27d0/0x3af0 net/core/rtnetlink.c:2868 Preemption disabled at: [<0000000000000000>] 0x0 CPU: 0 PID: 9825 Comm: syz-executor943 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8328 __mutex_lock_common kernel/locking/mutex.c:928 [inline] __mutex_lock+0xa9/0x1120 kernel/locking/mutex.c:1096 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline] addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline] __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline] ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline] inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3385 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x443869 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc4ce9e848 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffc4ce9e870 RCX: 0000000000443869 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d R10: 000000000000000d R11: 0000000000000246 R12: 00007ffc4ce9e860 R13: 00000000000f4240 R14: 0000000000014fb2 R15: 00007ffc4ce9e854 ============================= [ BUG: Invalid wait context ] 5.12.0-rc7-syzkaller #0 Tainted: G W ----------------------------- syz-executor943/9825 is trying to lock: ffff8880188a3530 (&idev->mc_lock){+.+.}-{3:3}, at: __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965 other info that might help us debug this: context-{4:4} 2 locks held by syz-executor943/9825: #0: ffffffff8d6730a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d6730a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5559 #1: ffffffff8bf74520 (rcu_read_lock){....}-{1:2}, at: nla_ok include/net/netlink.h:1159 [inline] #1: ffffffff8bf74520 (rcu_read_lock){....}-{1:2}, at: do_setlink+0x27d0/0x3af0 net/core/rtnetlink.c:2868 stack backtrace: CPU: 0 PID: 9825 Comm: syz-executor943 Tainted: G W 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_lock_invalid_wait_context kernel/locking/lockdep.c:4552 [inline] check_wait_context kernel/locking/lockdep.c:4613 [inline] __lock_acquire.cold+0x219/0x3b4 kernel/locking/lockdep.c:4851 lock_acquire kernel/locking/lockdep.c:5511 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476 __mutex_lock_common kernel/locking/mutex.c:949 [inline] __mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline] addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline] __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline] ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline] inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3385 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x443869 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc4ce9e848 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffc4ce9e870 RCX: 0000000000443869 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d R10: 000000000000000d R11: 0000000000000246 R12: 00007ffc4ce9e860 R13: 00000000000f4240 R14: 0000000000014fb2 R15: 00007ffc4ce9e854 BUG: sleeping function called from invalid context at include/linux/sched/mm.h:197 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 9825, name: syz-executor943 INFO: lockdep is turned off. Preemption disabled at: [<ffffffff87026ff3>] local_bh_disable include/linux/bottom_half.h:19 [inline] [<ffffffff87026ff3>] netif_addr_lock_bh include/linux/netdevice.h:4549 [inline] [<ffffffff87026ff3>] __dev_mc_del net/core/dev_addr_lists.c:814 [inline] [<ffffffff87026ff3>] dev_mc_del+0x63/0x110 net/core/dev_addr_lists.c:833 CPU: 0 PID: 9825 Comm: syz-executor943 Tainted: G W 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8328 might_alloc include/linux/sched/mm.h:197 [inline] slab_pre_alloc_hook mm/slab.h:497 [inline] slab_alloc_node mm/slub.c:2826 [inline] slab_alloc mm/slub.c:2915 [inline] kmem_cache_alloc_trace+0x263/0x2a0 mm/slub.c:2932 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] mld_add_delrec net/ipv6/mcast.c:737 [inline] igmp6_leave_group net/ipv6/mcast.c:2629 [inline] igmp6_group_dropped+0x4f7/0xe90 net/ipv6/mcast.c:717 __ipv6_dev_mc_dec+0x25d/0x340 net/ipv6/mcast.c:973 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline] addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline] __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline] ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline] inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3385 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x443869 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc4ce9e848 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffc4ce9e870 RCX: 0000000000443869 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d R10: 000000000000000d R11: 0000000000000246 R12: 00007ffc4ce9e860 R13: 00000000000f4240 R14: 0000000000014fb2 R15: 00007ffc4ce9e854 __nla_validate_parse: 52 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor943'. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
