Hello, syzbot found the following issue on: HEAD commit: 40f71e7cd3c6 Merge tag 'net-6.4-rc7' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1154eb17280000 kernel config: https://syzkaller.appspot.com/x/.config?x=b55c7ca2258f24ba dashboard link: https://syzkaller.appspot.com/bug?extid=87c490fd2be656269b6a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12acd517280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14276ecf280000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-40f71e7c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1d6d986d5baf/vmlinux-40f71e7c.xz kernel image: https://storage.googleapis.com/syzbot-assets/cb0c02dd7f64/bzImage-40f71e7c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+87c490fd2be656269b6a@xxxxxxxxxxxxxxxxxxxxxxxxx ================================ WARNING: inconsistent lock state 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor192/6901 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff88807ffdc728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] ffff88807ffdc728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: lru_gen_rotate_memcg+0x64/0xab0 mm/vmscan.c:4749 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] lru_gen_online_memcg+0x16b/0x5a0 mm/vmscan.c:4797 mem_cgroup_css_online+0x227/0x3b0 mm/memcontrol.c:5468 online_css+0xaf/0x2a0 kernel/cgroup/cgroup.c:5491 cgroup_init_subsys+0x46b/0x900 kernel/cgroup/cgroup.c:6022 cgroup_init+0xb83/0x1090 kernel/cgroup/cgroup.c:6106 start_kernel+0x398/0x490 init/main.c:1077 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556 x86_64_start_kernel+0xb3/0xc0 arch/x86/kernel/head64.c:537 secondary_startup_64_no_verify+0xf4/0xfb irq event stamp: 1403 hardirqs last enabled at (1402): [<ffffffff81dc88cf>] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (1402): [<ffffffff81dc88cf>] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (1403): [<ffffffff81dcc157>] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (1178): [<ffffffff880eb512>] rcu_read_unlock_bh include/linux/rcupdate.h:839 [inline] softirqs last enabled at (1178): [<ffffffff880eb512>] __dev_queue_xmit+0x1df2/0x3b10 net/core/dev.c:4271 softirqs last disabled at (1253): [<ffffffff814cefd4>] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (1253): [<ffffffff814cefd4>] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pgdat->memcg_lru.lock); <Interrupt> lock(&pgdat->memcg_lru.lock); *** DEADLOCK *** 2 locks held by syz-executor192/6901: #0: ffffffff8e10b9e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline] #0: ffffffff8e10b9e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3e8/0xd50 net/core/rtnetlink.c:6414 #1: ffffffff8c795fe0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #1: ffffffff8c795fe0 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 3 PID: 6901 Comm: syz-executor192 Not tainted 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3949 [inline] valid_state kernel/locking/lockdep.c:3991 [inline] mark_lock_irq kernel/locking/lockdep.c:4194 [inline] mark_lock.part.0+0x1110/0x1970 kernel/locking/lockdep.c:4656 mark_lock kernel/locking/lockdep.c:4620 [inline] mark_usage kernel/locking/lockdep.c:4545 [inline] __lock_acquire+0x1227/0x5f30 kernel/locking/lockdep.c:5042 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] lru_gen_rotate_memcg+0x64/0xab0 mm/vmscan.c:4749 lru_gen_soft_reclaim+0x62/0x70 mm/vmscan.c:4852 uncharge_batch+0x2be/0x560 mm/memcontrol.c:7145 __mem_cgroup_uncharge+0x11f/0x290 mm/memcontrol.c:7221 mem_cgroup_uncharge include/linux/memcontrol.h:698 [inline] __folio_put_small mm/swap.c:105 [inline] __folio_put+0xb6/0x140 mm/swap.c:129 folio_put include/linux/mm.h:1430 [inline] put_page include/linux/mm.h:1499 [inline] free_page_and_swap_cache+0x257/0x2c0 mm/swap_state.c:305 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:153 [inline] tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:208 rcu_do_batch kernel/rcu/tree.c:2115 [inline] rcu_core+0x806/0x1ad0 kernel/rcu/tree.c:2377 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x70 kernel/kcov.c:207 Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 bc 03 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 0c 16 00 00 85 c0 74 2b 8b 82 e8 15 00 00 <83> f8 02 75 20 48 8b 8a f0 15 00 00 8b 92 ec 15 00 00 48 8b 01 48 RSP: 0018:ffffc9000420ecf8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000064 RCX: 0000000000000000 RDX: ffff888044f60380 RSI: ffffffff8a021a9b RDI: 0000000000000001 RBP: ffff88802b6d6004 R08: 0000000000000001 R09: 000000000000006e R10: 0000000000000064 R11: 0000000000094001 R12: ffff888054ea8005 R13: 00000000ffffffff R14: 00000000ffffffff R15: dffffc0000000000 vsscanf+0x34b/0x2600 lib/vsprintf.c:3518 sscanf+0xbf/0xf0 lib/vsprintf.c:3716 __dev_alloc_name net/core/dev.c:1065 [inline] dev_alloc_name_ns+0x343/0x610 net/core/dev.c:1099 dev_get_valid_name+0x69/0x170 net/core/dev.c:1134 register_netdevice+0x3ba/0x1640 net/core/dev.c:10006 veth_newlink+0x352/0x9d0 drivers/net/veth.c:1897 rtnl_newlink_create net/core/rtnetlink.c:3465 [inline] __rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3682 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3695 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0ee7a7d049 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 16 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe607e0d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0ee7a7d049 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003 R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffe607e0db8 R13: 00007ffe607e0dd0 R14: 00007ffe607e0e10 R15: 00000000000006cd </TASK> ---------------- Code disassembly (best guess): 0: 81 e1 00 01 00 00 and $0x100,%ecx 6: 65 48 8b 14 25 00 bc mov %gs:0x3bc00,%rdx d: 03 00 f: a9 00 01 ff 00 test $0xff0100,%eax 14: 74 0e je 0x24 16: 85 c9 test %ecx,%ecx 18: 74 35 je 0x4f 1a: 8b 82 0c 16 00 00 mov 0x160c(%rdx),%eax 20: 85 c0 test %eax,%eax 22: 74 2b je 0x4f 24: 8b 82 e8 15 00 00 mov 0x15e8(%rdx),%eax * 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction 2d: 75 20 jne 0x4f 2f: 48 8b 8a f0 15 00 00 mov 0x15f0(%rdx),%rcx 36: 8b 92 ec 15 00 00 mov 0x15ec(%rdx),%edx 3c: 48 8b 01 mov (%rcx),%rax 3f: 48 rex.W --- 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. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
