bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7014/1:b..l rcu: (detected by 0, t=10503 jiffies, g=17489, q=1477 ncpus=2) task:syz.1.215 state:R running task stack:27096 pid:7014 tgid:7014 ppid:5863 task_flags:0x40044c flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6947 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6971 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1761 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0x3756/0x4210 mm/memory.c:1894 unmap_vmas+0x25d/0x3c0 mm/memory.c:1984 exit_mmap+0x245/0xba0 mm/mmap.c:1284 __mmput+0x118/0x420 kernel/fork.c:1379 exit_mm+0x1da/0x2c0 kernel/exit.c:589 do_exit+0x859/0x2550 kernel/exit.c:940 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x125e/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x95/0x780 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f68bed8e969 RSP: 002b:00007ffc2a9cfcb8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f68befb7ba0 RCX: 00007f68bed8e969 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f68befb7ba0 R08: 00000000000000ec R09: 0000000d2a9cffaf R10: 00007f68befb7ac0 R11: 0000000000000246 R12: 000000000005689c R13: 00007f68befb6080 R14: ffffffffffffffff R15: 00007ffc2a9cfdd0 rcu: rcu_preempt kthread starved for 601 jiffies! g17489 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x165/0x360 kernel/sched/core.c:6860 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5162 Comm: jbd2/sda1-8 Not tainted 6.15.0-rc5-syzkaller-00984-gd97e2634fbdc #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x28/0x90 kernel/kcov.c:314 Code: 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 14 25 08 00 76 92 65 8b 0d 88 2b b6 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b <83> ba 3c 16 00 00 00 74 52 8b 8a 18 16 00 00 83 f9 03 75 47 48 8b RSP: 0018:ffffc90000a08a78 EFLAGS: 00000246 RAX: ffffffff894386b9 RBX: ffffffff894383f5 RCX: 0000000000000100 RDX: ffff888032e95a00 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000a08ba8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff894383f5 R12: 0000000000000001 R13: dffffc0000000000 R14: ffff8880889d03c0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f489ae4de80 CR3: 00000000581f0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock include/linux/rcupdate.h:842 [inline] process_backlog+0x599/0x14f0 net/core/dev.c:6405 __napi_poll+0xc4/0x480 net/core/dev.c:7378 napi_poll net/core/dev.c:7442 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7564 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:slab_update_freelist mm/slub.c:739 [inline] RIP: 0010:__slab_free+0x270/0x400 mm/slub.c:4494 Code: ea 48 8b 4c 24 10 4d 89 f8 e8 2c e0 ff ff 41 89 c7 e9 23 fe ff ff 48 8b 5c 24 10 4c 89 f9 4c 89 ea 4c 89 c8 f0 48 0f c7 4e 20 <0f> 85 54 fe ff ff 48 85 ed 75 2c 45 85 ed 79 59 65 48 8b 05 38 43 RSP: 0018:ffffc9000fe2f4d8 EFLAGS: 00000242 RAX: ffff88805ef80000 RBX: ffff88805ef82000 RCX: 0000000000040002 RDX: 0000000000040003 RSI: ffffea00017be000 RDI: ffffffff00000000 RBP: 0000000000000000 R08: 0000000000000002 R09: ffff88805ef80000 R10: 0000000000000000 R11: fffffbfff1efe58f R12: 0000000000000000 R13: 0000000000040003 R14: 0000000000000000 R15: 0000000000040002 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203 alloc_buffer_head+0x2a/0x270 fs/buffer.c:3032 folio_alloc_buffers+0x32d/0x640 fs/buffer.c:937 grow_dev_folio fs/buffer.c:1077 [inline] grow_buffers fs/buffer.c:1118 [inline] __getblk_slow fs/buffer.c:1144 [inline] bdev_getblk+0x2bf/0x670 fs/buffer.c:1466 __getblk include/linux/buffer_head.h:382 [inline] jbd2_journal_get_descriptor_buffer+0x147/0x420 fs/jbd2/journal.c:978 journal_submit_commit_record+0xec/0x8b0 fs/jbd2/commit.c:129 jbd2_journal_commit_transaction+0x33a0/0x5960 fs/jbd2/commit.c:875 kjournald2+0x3cf/0x750 fs/jbd2/journal.c:201 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 8793 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, 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:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, 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:e6:37:3e:70:61:ef, 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:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, vlan:0) net_ratelimit: 10445 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 veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, 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 veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:e6:37:3e:70:61:ef, 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:e6:37:3e:70:61:ef, vlan:0)