INFO: task syz.3.5014:15444 blocked for more than 122 seconds. Not tainted 6.12.30-syzkaller-g1ccb219f8cda #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.5014 state:D stack:0 pid:15444 tgid:15439 ppid:13887 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5924 [inline] __schedule+0x145b/0x1f10 kernel/sched/core.c:7750 __schedule_loop kernel/sched/core.c:7831 [inline] schedule+0xc6/0x240 kernel/sched/core.c:7846 request_wait_answer fs/fuse/dev.c:472 [inline] __fuse_request_send fs/fuse/dev.c:487 [inline] __fuse_simple_request+0xdac/0x1970 fs/fuse/dev.c:582 fuse_simple_request fs/fuse/fuse_i.h:1248 [inline] fuse_dentry_revalidate+0x5df/0xa90 fs/fuse/dir.c:296 d_revalidate fs/namei.c:868 [inline] lookup_dcache fs/namei.c:1596 [inline] lookup_one_qstr_excl+0x1a4/0x280 fs/namei.c:1618 do_renameat2+0x4c2/0xc80 fs/namei.c:5120 __do_sys_rename fs/namei.c:5217 [inline] __se_sys_rename fs/namei.c:5215 [inline] __x64_sys_rename+0x86/0xa0 fs/namei.c:5215 x64_sys_call+0x150b/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fdc57b8e929 RSP: 002b:00007fdc58a8d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fdc57db6160 RCX: 00007fdc57b8e929 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000280 RBP: 00007fdc57c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdc57db6160 R15: 00007fff337bc338 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.30-syzkaller-g1ccb219f8cda #0 7a2e1ed1be67dd4e5f42c8044c2ea2ca0199c2ac 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:229 [inline] watchdog+0xd8f/0xed0 kernel/hung_task.c:385 kthread+0x2ca/0x370 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 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: 17 Comm: ksoftirqd/0 Not tainted 6.12.30-syzkaller-g1ccb219f8cda #0 7a2e1ed1be67dd4e5f42c8044c2ea2ca0199c2ac Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 6f 05 48 89 de e8 70 f7 51 00 5b 5d e9 c9 1d 02 04 cc cc cc cc cc cc cc cc cc b8 14 c2 8c 3a 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 48 8b 45 08 65 48 8b 0c 25 40 e9 04 00 65 RSP: 0018:ffffc90000117218 EFLAGS: 00000246 RAX: ffffffff846132fa RBX: 0000000000000000 RCX: 0000000000000100 RDX: ffff888103650000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900001172a8 R08: ffff8881193de737 R09: 1ffff1102327bce6 R10: dffffc0000000000 R11: ffffed102327bce7 R12: ffff88811dc97d00 R13: dffffc0000000000 R14: ffff8881193de720 R15: ffff8881193de6be FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f27ba2e7d60 CR3: 0000000109fa8000 CR4: 00000000003526b0 Call Trace: skb_release_all net/core/skbuff.c:1200 [inline] __kfree_skb+0x62/0x210 net/core/skbuff.c:1214 consume_skb+0x65/0x1a0 net/core/skbuff.c:1446 netlink_broadcast_filtered+0x10e7/0x1200 net/netlink/af_netlink.c:1527 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline] nlmsg_multicast include/net/netlink.h:1144 [inline] nlmsg_notify+0xf1/0x1b0 net/netlink/af_netlink.c:2580 rtnl_notify+0x9e/0xd0 net/core/rtnetlink.c:786 fdb_notify+0xce/0x150 net/bridge/br_fdb.c:206 br_fdb_update+0x4b7/0x680 net/bridge/br_fdb.c:941 br_handle_frame_finish+0x39c/0x1720 net/bridge/br_input.c:141 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+0xf4b/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:6202 __napi_poll+0xd0/0x610 net/core/dev.c:6853 napi_poll net/core/dev.c:6922 [inline] net_rx_action+0x584/0xce0 net/core/dev.c:7044 handle_softirqs+0x1ae/0x630 kernel/softirq.c:603 run_ksoftirqd+0x20/0x30 kernel/softirq.c:981 smpboot_thread_fn+0x493/0x8c0 kernel/smpboot.c:164 kthread+0x2ca/0x370 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 net_ratelimit: 103982 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:22:57:4c:8d:fd:7b, 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:22:57:4c:8d:fd:7b, 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:22:57:4c:8d:fd:7b, 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:22:57:4c:8d:fd:7b, 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:22:57:4c:8d:fd:7b, vlan:0)