INFO: task syz.1.276:1150 blocked for more than 125 seconds. Not tainted 6.12.38-syzkaller-ge9bbc29c066a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-ge9bbc29c066a #0 23782410f292bc05d82a7d68d5e797d6f188417b Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120 dump_stack+0x19/0x20 lib/dump_stack.c:129 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline] watchdog+0xd8f/0xed0 kernel/hung_task.c:423 kthread+0x2ca/0x370 kernel/kthread.c:389 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 848 Comm: syz.1.168 Not tainted 6.12.38-syzkaller-ge9bbc29c066a #0 23782410f292bc05d82a7d68d5e797d6f188417b Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:arch_stack_walk+0xfc/0x170 arch/x86/kernel/stacktrace.c:-1 Code: 74 0a 49 8b 8c 24 98 0d 00 00 eb 03 48 89 e9 48 8d bd 78 ff ff ff 4c 89 e6 4c 89 fa e8 4d 98 06 00 83 bd 78 ff ff ff 00 74 46 <4c> 8d bd 78 ff ff ff 4c 89 ff e8 05 88 06 00 48 85 c0 74 32 48 89 RSP: 0018:ffffc90000006c88 EFLAGS: 00000202 RAX: ffffc90000006d10 RBX: ffffc90000006d40 RCX: 1ffff92000000d98 RDX: ffffc90000006d18 RSI: 1ffff92000000d92 RDI: ffffc90000006ce0 RBP: ffffc90000006d10 R08: ffffc90000006c00 R09: 0000000000000000 R10: ffffc90000006c88 R11: fffff52000000d9d R12: ffff888136b1df00 R13: 1ffff92000000dbc R14: ffffffff817429f0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff38d28ecc CR3: 0000000114c76000 CR4: 00000000003526b0 Call Trace: stack_trace_save+0x9d/0xe0 kernel/stacktrace.c:122 save_stack+0xf8/0x1f0 mm/page_owner.c:174 __set_page_owner+0x8e/0x5d0 mm/page_owner.c:338 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x3b9/0x3f0 mm/page_alloc.c:1791 prep_new_page+0x1c/0x120 mm/page_alloc.c:1799 get_page_from_freelist+0x46bb/0x4750 mm/page_alloc.c:3850 __alloc_pages_noprof+0x30d/0x6c0 mm/page_alloc.c:5191 alloc_slab_page+0x6b/0x1f0 mm/slub.c:-1 allocate_slab+0x69/0x440 mm/slub.c:2659 new_slab mm/slub.c:2713 [inline] ___slab_alloc+0x59a/0x8b0 mm/slub.c:3901 __slab_alloc mm/slub.c:3991 [inline] __slab_alloc_node mm/slub.c:4044 [inline] slab_alloc_node mm/slub.c:4205 [inline] kmem_cache_alloc_noprof+0x202/0x3a0 mm/slub.c:4226 skb_clone+0x229/0x460 net/core/skbuff.c:2082 deliver_clone net/bridge/br_forward.c:125 [inline] br_flood+0x661/0x730 net/bridge/br_forward.c:245 br_handle_frame_finish+0x12bb/0x1720 net/bridge/br_input.c:215 nf_hook_bridge_pre net/bridge/br_input.c:301 [inline] br_handle_frame+0x5a6/0xba0 net/bridge/br_input.c:424 __netif_receive_skb_core+0xf48/0x3940 net/core/dev.c:5651 __netif_receive_skb_one_core net/core/dev.c:5755 [inline] __netif_receive_skb net/core/dev.c:5870 [inline] process_backlog+0x3e5/0xae0 net/core/dev.c:6206 __napi_poll+0xd0/0x610 net/core/dev.c:6857 napi_poll net/core/dev.c:6926 [inline] net_rx_action+0x584/0xce0 net/core/dev.c:7048 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621 __do_softirq+0xf/0x16 kernel/softirq.c:659 do_softirq+0xa6/0x100 kernel/softirq.c:503 __local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430 __raw_write_unlock_bh include/linux/rwlock_api_smp.h:281 [inline] _raw_write_unlock_bh+0x33/0x70 kernel/locking/spinlock.c:366 sock_orphan include/net/sock.h:2061 [inline] sk_common_release+0x1a3/0x340 net/core/sock.c:3867 raw_close+0x25/0x30 net/ipv4/raw.c:689 inet_release+0x1b4/0x2c0 net/ipv4/af_inet.c:442 __sock_release net/socket.c:659 [inline] sock_close+0xdd/0x280 net/socket.c:1427 __fput+0x1fe/0xa00 fs/file_table.c:429 ____fput+0x20/0x30 fs/file_table.c:457 task_work_run+0x1e0/0x250 kernel/task_work.c:240 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0x9bc/0x2630 kernel/exit.c:953 do_group_exit+0x22a/0x300 kernel/exit.c:1095 get_signal+0x139d/0x14f0 kernel/signal.c:2933 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0x58/0xb0 kernel/entry/common.c:218 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f27ccdc1265 Code: Unable to access opcode bytes at 0x7f27ccdc123b. RSP: 002b:00007f27ccbc9f80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: fffffffffffffdfc RBX: 00007f27ccfb6080 RCX: 00007f27ccdc1265 RDX: 00007f27ccbc9fc0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f27cce10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f27ccfb6080 R15: 00007ffe8fbc2238 net_ratelimit: 137272 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8e:c9:78:1b:79:d9, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8e:c9:78:1b:79:d9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) net_ratelimit: 149712 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:8e:c9:78:1b:79:d9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8e:c9:78:1b:79:d9, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:8e:c9:78:1b:79:d9, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)