INFO: task syz.6.408:10230 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.408       state:D stack:28208 pid:10230 tgid:10154 ppid:8544   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
 inode_lock include/linux/fs.h:818 [inline]
 bch2_fallocate_dispatch+0x1e2/0x540 fs/bcachefs/fs-io.c:771
 vfs_fallocate+0x569/0x6e0 fs/open.c:327
 ksys_fallocate fs/open.c:351 [inline]
 __do_sys_fallocate fs/open.c:356 [inline]
 __se_sys_fallocate fs/open.c:354 [inline]
 __x64_sys_fallocate+0xbc/0x110 fs/open.c:354
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f548ff7ff19
RSP: 002b:00007f5490da4058 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f5490146080 RCX: 00007f548ff7ff19
RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007f548fff3cc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000002328 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5490146080 R15: 00007ffedcc6c248
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
 watchdog+0xff6/0x1040 kernel/hung_task.c:397
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14805 Comm: kworker/u8:9 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:__ipv6_dev_get_saddr+0xd4/0x4b0 net/ipv6/addrconf.c:1734
Code: e0 05 4c 01 e8 48 89 04 24 48 8b 6c 24 08 4c 01 ed 49 8d 5f 6c 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 0f 85 b1 02 00 00 8b 1b 83 e3 44 bf 40 00 00 00 89 de e8 03
RSP: 0018:ffffc9000403ead8 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff888026f2946c RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000040
RBP: ffffc9000403eba0 R08: ffffffff8a605d2d R09: 1ffff92000807d76
R10: dffffc0000000000 R11: fffff52000807d77 R12: ffffc9000403eba8
R13: ffffc9000403eba0 R14: ffff88805f50bc80 R15: ffff888026f29400
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055df38979680 CR3: 000000000e736000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 ipv6_dev_get_saddr+0x555/0xc10 net/ipv6/addrconf.c:1890
 ip6_route_get_saddr include/net/ip6_route.h:147 [inline]
 ip6_dst_lookup_tail+0xf18/0x14f0 net/ipv6/ip6_output.c:1133
 ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1259
 udp_tunnel6_dst_lookup+0x2be/0x520 net/ipv6/ip6_udp_tunnel.c:165
 geneve6_xmit_skb drivers/net/geneve.c:950 [inline]
 geneve_xmit+0xcf2/0x2d00 drivers/net/geneve.c:1036
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606
 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4434
 neigh_output include/net/neighbour.h:539 [inline]
 ip6_finish_output2+0x12c7/0x17b0 net/ipv6/ip6_output.c:141
 ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ndisc_send_skb+0xb30/0x1450 net/ipv6/ndisc.c:511
 ndisc_send_ns+0xcc/0x160 net/ipv6/ndisc.c:669
 addrconf_dad_work+0xb45/0x16f0 net/ipv6/addrconf.c:4303
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>