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) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (6 ticks this GP) idle=2ff/1/0x4000000000000002 softirq=63348/63348 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P28951 (detected by 0, t=10506 jiffies, g=85461, q=2239) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 28951 Comm: syz.7.6151 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x58/0x60 kernel/kcov.c:216 Code: 10 16 00 00 83 fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48 8d 7e 01 8b 89 14 16 00 00 48 39 cf 73 08 48 89 44 f2 08 48 89 3a 0f 1f 80 00 00 00 00 48 8b 04 24 65 48 8b 0d 44 4e 89 7e 65 8b RSP: 0018:ffffc90000dd0ef8 EFLAGS: 00000006 RAX: ffffffff81850d72 RBX: ffff8880b913b1f8 RCX: ffff88802a295940 RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000dd0fb0 R08: ffff8880b913b1fb R09: 1ffff1101722763f R10: dffffc0000000000 R11: ffffed1017227640 R12: 1ffff1101722763f R13: 0000000000000022 R14: ffff8880b913b1f0 R15: 0000000000000023 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc388719f00 CR3: 0000000025109000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: get_current arch/x86/include/asm/current.h:15 [inline] irq_work_single kernel/irq_work.c:154 [inline] irq_work_run_list+0x172/0x340 kernel/irq_work.c:177 irq_work_run+0x63/0xe0 kernel/irq_work.c:186 __sysvec_irq_work+0x98/0x240 arch/x86/kernel/irq_work.c:22 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 12 f2 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc9000325f840 EFLAGS: 00000206 RAX: 683d3c0ab5f81000 RBX: 1ffff9200064bf0c RCX: 683d3c0ab5f81000 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f980 RBP: ffffc9000325f918 R08: ffffffff901d40cf R09: 1ffffffff203a819 R10: dffffc0000000000 R11: fffffbfff203a81a R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c322fe0 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock+0x85/0x90 include/linux/rcupdate.h:772 dput+0xc0/0x1a0 fs/dcache.c:886 __fput+0x5ee/0x930 fs/file_table.c:319 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x626/0x20c0 kernel/exit.c:883 do_group_exit+0x12e/0x300 kernel/exit.c:997 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7df42b3819 Code: Unable to access opcode bytes at RIP 0x7f7df42b37ef. RSP: 002b:00007f7df24ec028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 000000000000000d RBX: 00007f7df452d090 RCX: 00007f7df42b3819 RDX: fbffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007f7df4349c91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7df452d128 R14: 00007f7df452d090 R15: 00007ffecff17f58 task:syz.7.6151 state:R running task stack:27120 pid:28951 ppid: 21672 flags:0x0000400e Call Trace: rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g85461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=55311 rcu: rcu_preempt kthread starved for 10506 jiffies! g85461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:27504 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395 schedule+0x11b/0x1e0 kernel/sched/core.c:6478 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 28951 Comm: syz.7.6151 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31 Code: 41 5f 5d c3 48 c7 c7 86 d9 de 8b eb 0a 48 c7 c7 80 fe c4 8b 48 89 de e8 d8 93 f3 07 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 43 ef ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 RSP: 0018:ffffc90000dd0ef8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880b913b1f8 RCX: ffffffff81850d17 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8880b913b1f8 RBP: ffffc90000dd0fb0 R08: ffff8880b9133d77 R09: 1ffff110172267ae R10: dffffc0000000000 R11: ffffed10172267af R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880b913b1f0 R15: 1ffff920001ba1e4 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc388719f00 CR3: 0000000025109000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] irq_work_single kernel/irq_work.c:145 [inline] irq_work_run_list+0x117/0x340 kernel/irq_work.c:177 irq_work_run+0x63/0xe0 kernel/irq_work.c:186 __sysvec_irq_work+0x98/0x240 arch/x86/kernel/irq_work.c:22 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 12 f2 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc9000325f840 EFLAGS: 00000206 RAX: 683d3c0ab5f81000 RBX: 1ffff9200064bf0c RCX: 683d3c0ab5f81000 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f980 RBP: ffffc9000325f918 R08: ffffffff901d40cf R09: 1ffffffff203a819 R10: dffffc0000000000 R11: fffffbfff203a81a R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c322fe0 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock+0x85/0x90 include/linux/rcupdate.h:772 dput+0xc0/0x1a0 fs/dcache.c:886 __fput+0x5ee/0x930 fs/file_table.c:319 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x626/0x20c0 kernel/exit.c:883 do_group_exit+0x12e/0x300 kernel/exit.c:997 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7df42b3819 Code: Unable to access opcode bytes at RIP 0x7f7df42b37ef. RSP: 002b:00007f7df24ec028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 000000000000000d RBX: 00007f7df452d090 RCX: 00007f7df42b3819 RDX: fbffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007f7df4349c91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7df452d128 R14: 00007f7df452d090 R15: 00007ffecff17f58 net_ratelimit: 403 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:ff:ff, 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 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:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:1a:19:de:bc:6a:a3, vlan:0) net_ratelimit: 600 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:1a:19:de:bc:6a:a3, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:1a:19:de:bc:6a:a3, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:ff:ff, 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 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:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:ff:ff, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:ff:ff, vlan:0)