============================================
WARNING: possible recursive locking detected
6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 Not tainted
--------------------------------------------
dhcpcd-run-hook/8964 is trying to acquire lock:
ffff888059d7af30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff888059d7af30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220 net/hsr/hsr_device.c:234
but task is already holding lock:
ffff88807fadcf30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff88807fadcf30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220 net/hsr/hsr_device.c:234
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&hsr->seqnr_lock);
lock(&hsr->seqnr_lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
12 locks held by dhcpcd-run-hook/8964:
#0: ffff8880305881e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:146 [inline]
#0: ffff8880305881e0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1bd/0x4c0 mm/util.c:577
#1: ffff88802295ea18 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: i_mmap_lock_write include/linux/fs.h:545 [inline]
#1: ffff88802295ea18 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: vma_prepare+0x12f/0x4b0 mm/vma.c:264
#2: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#2: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: is_bpf_text_address+0x26/0x2b0 kernel/bpf/core.c:772
#3: ffffc90000007be0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0 kernel/time/timer.c:1786
#4: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x208/0x1400 net/ipv6/ndisc.c:484
#5: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#5: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#5: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0 net/ipv6/ip6_output.c:126
#6: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#6: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
#6: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70 net/core/dev.c:4554
#7: ffff88807fadcf30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#7: ffff88807fadcf30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220 net/hsr/hsr_device.c:234
#8: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#8: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#8: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: hsr_forward_skb+0x9e/0x2860 net/hsr/hsr_forward.c:728
#9: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#9: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
#9: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70 net/core/dev.c:4554
#10: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#10: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#10: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: br_dev_xmit+0x185/0x1840 net/bridge/br_device.c:52
#11: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#11: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
#11: ffffffff8df3dd40 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70 net/core/dev.c:4554
stack backtrace:
CPU: 0 UID: 0 PID: 8964 Comm: dhcpcd-run-hook Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3042
check_deadlock kernel/locking/lockdep.c:3094 [inline]
validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3896
__lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
hsr_dev_xmit+0x19a/0x220 net/hsr/hsr_device.c:234
__netdev_start_xmit include/linux/netdevice.h:5204 [inline]
netdev_start_xmit include/linux/netdevice.h:5213 [inline]
xmit_one net/core/dev.c:3776 [inline]
dev_hard_start_xmit+0x302/0x880 net/core/dev.c:3792
__dev_queue_xmit+0x1adf/0x3a70 net/core/dev.c:4629
dev_queue_xmit include/linux/netdevice.h:3350 [inline]
br_dev_queue_push_xmit+0x6c5/0x890 net/bridge/br_forward.c:53
NF_HOOK+0x31d/0x3c0 include/linux/netfilter.h:314
br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
NF_HOOK+0x31d/0x3c0 include/linux/netfilter.h:314
__br_forward+0x41e/0x600 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb5/0x160 net/bridge/br_forward.c:190
br_flood+0x31a/0x6a0 net/bridge/br_forward.c:237
br_dev_xmit+0x11b3/0x1840 net/bridge/br_device.c:108
__netdev_start_xmit include/linux/netdevice.h:5204 [inline]
netdev_start_xmit include/linux/netdevice.h:5213 [inline]
xmit_one net/core/dev.c:3776 [inline]
dev_hard_start_xmit+0x302/0x880 net/core/dev.c:3792
__dev_queue_xmit+0x1adf/0x3a70 net/core/dev.c:4629
dev_queue_xmit include/linux/netdevice.h:3350 [inline]
hsr_xmit net/hsr/hsr_forward.c:430 [inline]
hsr_forward_do net/hsr/hsr_forward.c:571 [inline]
hsr_forward_skb+0x158b/0x2860 net/hsr/hsr_forward.c:733
hsr_dev_xmit+0x1a5/0x220 net/hsr/hsr_device.c:235
__netdev_start_xmit include/linux/netdevice.h:5204 [inline]
netdev_start_xmit include/linux/netdevice.h:5213 [inline]
xmit_one net/core/dev.c:3776 [inline]
dev_hard_start_xmit+0x302/0x880 net/core/dev.c:3792
__dev_queue_xmit+0x1adf/0x3a70 net/core/dev.c:4629
neigh_output include/net/neighbour.h:539 [inline]
ip6_finish_output2+0x11fe/0x16a0 net/ipv6/ip6_output.c:141
__ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]
ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226
NF_HOOK include/linux/netfilter.h:314 [inline]
ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4041
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
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:__lt_find include/linux/rbtree_latch.h:-1 [inline]
RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:210 [inline]
RIP: 0010:bpf_ksym_find kernel/bpf/core.c:740 [inline]
RIP: 0010:is_bpf_text_address+0xf0/0x2b0 kernel/bpf/core.c:773
Code: bd 00 00 00 00 00 fc ff df 44 8b 25 da 58 f2 0b 44 89 e3 83 e3 01 4c 8d 3c dd f0 13 c1 8d 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 ff e8 36 30 53 00 4d 8b 3f 4d 85 ff 0f 84 c1 00 00 00
RSP: 0018:ffffc9000380e7f0 EFLAGS: 00000246
RAX: 1ffffffff1b8227e RBX: 0000000000000000 RCX: ffff88802e8fda00
RDX: 0000000000000000 RSI: ffffffff8bc1f320 RDI: ffffffff8bc1f2e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81ceba36 R12: 0000000000000004
R13: dffffc0000000000 R14: 00007f29f31df242 R15: ffffffff8dc113f0
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548
__call_rcu_common kernel/rcu/tree.c:3082 [inline]
call_rcu+0x142/0x990 kernel/rcu/tree.c:3202
mas_wr_node_store lib/maple_tree.c:3863 [inline]
mas_wr_store_entry+0x1eaf/0x2550 lib/maple_tree.c:4083
mas_store_prealloc+0xb02/0xf60 lib/maple_tree.c:5475
vma_iter_store_new mm/vma.h:455 [inline]
vma_complete+0x224/0xa90 mm/vma.c:323
__split_vma+0x84f/0x9b0 mm/vma.c:523
vms_gather_munmap_vmas+0x4ab/0x12b0 mm/vma.c:1336
__mmap_prepare mm/vma.c:2303 [inline]
__mmap_region mm/vma.c:2506 [inline]
mmap_region+0x5f5/0x1e50 mm/vma.c:2597
do_mmap+0xc68/0x1100 mm/mmap.c:561
vm_mmap_pgoff+0x31b/0x4c0 mm/util.c:579
ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29f31df242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffeaa60af18 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f29f2eb1000 RCX: 00007f29f31df242
RDX: 0000000000000001 RSI: 0000000000002000 RDI: 00007f29f2eb1000
RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000005000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffeaa60afa0
R13: 00007f29f2eb60c0 R14: 00007ffeaa60b350 R15: 00000fffd54c15e6
----------------
Code disassembly (best guess):
0: bd 00 00 00 00 mov $0x0,%ebp
5: 00 fc add %bh,%ah
7: ff (bad)
8: df 44 8b 25 filds 0x25(%rbx,%rcx,4)
c: da 58 f2 ficompl -0xe(%rax)
f: 0b 44 89 e3 or -0x1d(%rcx,%rcx,4),%eax
13: 83 e3 01 and $0x1,%ebx
16: 4c 8d 3c dd f0 13 c1 lea -0x723eec10(,%rbx,8),%r15
1d: 8d
1e: 4c 89 f8 mov %r15,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
* 2a: 74 08 je 0x34 <-- trapping instruction
2c: 4c 89 ff mov %r15,%rdi
2f: e8 36 30 53 00 call 0x53306a
34: 4d 8b 3f mov (%r15),%r15
37: 4d 85 ff test %r15,%r15
3a: 0f 84 c1 00 00 00 je 0x101