============================================
WARNING: possible recursive locking detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
--------------------------------------------
syz-executor.3/5099 is trying to acquire lock:
ffff8880110ceda0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880110ceda0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: hsr_dev_xmit+0x13e/0x1d0 net/hsr/hsr_device.c:229
but task is already holding lock:
ffff88807c4feda0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff88807c4feda0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: send_hsr_supervision_frame+0x276/0xad0 net/hsr/hsr_device.c:310
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
15 locks held by syz-executor.3/5099:
#0: ffffffff8e1dbab0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap kernel/fork.c:637 [inline]
#0: ffffffff8e1dbab0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1687 [inline]
#0: ffffffff8e1dbab0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x272/0x21b0 kernel/fork.c:1736
#1: ffff88807c25d720 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:124 [inline]
#1: ffff88807c25d720 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap kernel/fork.c:638 [inline]
#1: ffff88807c25d720 (&mm->mmap_lock){++++}-{3:3}, at: dup_mm kernel/fork.c:1687 [inline]
#1: ffff88807c25d720 (&mm->mmap_lock){++++}-{3:3}, at: copy_mm+0x292/0x21b0 kernel/fork.c:1736
#2: ffff88801e5e73a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:115 [inline]
#2: ffff88801e5e73a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap kernel/fork.c:647 [inline]
#2: ffff88801e5e73a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mm kernel/fork.c:1687 [inline]
#2: ffff88801e5e73a0 (&mm->mmap_lock/1){+.+.}-{3:3}, at: copy_mm+0x3cc/0x21b0 kernel/fork.c:1736
#3: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#3: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#3: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x82/0x380 mm/pgtable-generic.c:285
#4: ffff88801fb60378 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#4: ffff88801fb60378 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0x1ba/0x300 mm/pgtable-generic.c:373
#5: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#5: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#5: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: __pte_offset_map+0x82/0x380 mm/pgtable-generic.c:285
#6: ffff88806029a258 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:1059 [inline]
#6: ffff88806029a258 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1187 [inline]
#6: ffff88806029a258 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1224 [inline]
#6: ffff88806029a258 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1248 [inline]
#6: ffff88806029a258 (ptlock_ptr(ptdesc)#2/1){+.+.}-{2:2}, at: copy_page_range+0x108a/0x4240 mm/memory.c:1346
#7: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#7: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#7: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x20/0x2a0 mm/page_ext.c:508
#8: ffffc90000a08c00 ((&hsr->announce_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x600 kernel/time/timer.c:1789
#9: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#9: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#9: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: hsr_announce+0xa3/0x370 net/hsr/hsr_device.c:387
#10: ffff88807c4feda0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#10: ffff88807c4feda0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: send_hsr_supervision_frame+0x276/0xad0 net/hsr/hsr_device.c:310
#11: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#11: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#11: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: hsr_forward_skb+0xae/0x2400 net/hsr/hsr_forward.c:614
#12: ffffffff8e132080 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#12: ffffffff8e132080 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline]
#12: ffffffff8e132080 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x2c4/0x3b10 net/core/dev.c:4260
#13: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#13: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#13: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: br_dev_xmit+0x1b9/0x1a10 net/bridge/br_device.c:44
#14: ffffffff8e132080 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#14: ffffffff8e132080 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline]
#14: ffffffff8e132080 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x2c4/0x3b10 net/core/dev.c:4260
stack backtrace:
CPU: 1 PID: 5099 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
check_deadlock kernel/locking/lockdep.c:3062 [inline]
validate_chain+0x15c1/0x58e0 kernel/locking/lockdep.c:3856
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
hsr_dev_xmit+0x13e/0x1d0 net/hsr/hsr_device.c:229
__netdev_start_xmit include/linux/netdevice.h:4903 [inline]
netdev_start_xmit include/linux/netdevice.h:4917 [inline]
xmit_one net/core/dev.c:3531 [inline]
dev_hard_start_xmit+0x26c/0x790 net/core/dev.c:3547
__dev_queue_xmit+0x19f4/0x3b10 net/core/dev.c:4335
dev_queue_xmit include/linux/netdevice.h:3091 [inline]
br_dev_queue_push_xmit+0x701/0x8d0 net/bridge/br_forward.c:53
NF_HOOK+0x3a9/0x460 include/linux/netfilter.h:314
br_forward_finish+0xe5/0x140 net/bridge/br_forward.c:66
NF_HOOK+0x3a9/0x460 include/linux/netfilter.h:314
__br_forward+0x489/0x660 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:190
br_flood+0x2e4/0x660 net/bridge/br_forward.c:236
br_dev_xmit+0x118c/0x1a10
__netdev_start_xmit include/linux/netdevice.h:4903 [inline]
netdev_start_xmit include/linux/netdevice.h:4917 [inline]
xmit_one net/core/dev.c:3531 [inline]
dev_hard_start_xmit+0x26c/0x790 net/core/dev.c:3547
__dev_queue_xmit+0x19f4/0x3b10 net/core/dev.c:4335
dev_queue_xmit include/linux/netdevice.h:3091 [inline]
hsr_xmit net/hsr/hsr_forward.c:380 [inline]
hsr_forward_do net/hsr/hsr_forward.c:471 [inline]
hsr_forward_skb+0x183f/0x2400 net/hsr/hsr_forward.c:619
send_hsr_supervision_frame+0x548/0xad0 net/hsr/hsr_device.c:333
hsr_announce+0x1ab/0x370 net/hsr/hsr_device.c:389
call_timer_fn+0x180/0x600 kernel/time/timer.c:1792
expire_timers kernel/time/timer.c:1843 [inline]
__run_timers kernel/time/timer.c:2408 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2419
run_timer_base kernel/time/timer.c:2428 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2438
__do_softirq+0x2be/0x943 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_is_watching+0x72/0xb0 kernel/rcu/tree.c:702
Code: 7d 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 22 8b 03 65 ff 0d 21 66 88 7e 74 10 83 e0 04 c1 e8 02 5b 41 5e <41> 5f e9 e7 e1 03 0a e8 f2 20 85 ff eb e9 89 d9 80 e1 07 80 c1 03
RSP: 0018:ffffc900046c72b0 EFLAGS: 00000212
RAX: 0000000000000001 RBX: ffffea0001a681c0 RCX: ffff88805f62bc00
RDX: ffff88805f62bc00 RSI: ffffffff8bfed2e0 RDI: ffffffff8bfed2a0
RBP: 0000000000000001 R08: ffffffff8203ecb1 R09: 1ffffffff259caa0
R10: dffffc0000000000 R11: fffffbfff259caa1 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff8203ec80 R15: dffffc0000000000
rcu_read_lock include/linux/rcupdate.h:751 [inline]
page_ext_get+0x5a/0x2a0 mm/page_ext.c:508
page_table_check_set+0x5d/0x700 mm/page_table_check.c:109
__page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:241 [inline]
copy_present_pte mm/memory.c:993 [inline]
copy_pte_range mm/memory.c:1102 [inline]
copy_pmd_range mm/memory.c:1187 [inline]
copy_pud_range mm/memory.c:1224 [inline]
copy_p4d_range mm/memory.c:1248 [inline]
copy_page_range+0x2c7f/0x4240 mm/memory.c:1346
dup_mmap kernel/fork.c:747 [inline]
dup_mm kernel/fork.c:1687 [inline]
copy_mm+0x12f5/0x21b0 kernel/fork.c:1736
copy_process+0x187a/0x3df0 kernel/fork.c:2389
kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
__do_sys_clone kernel/fork.c:2939 [inline]
__se_sys_clone kernel/fork.c:2923 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2923
do_syscall_64+0xfd/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f8d48e7add3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd23e8b248 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8d48e7add3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555576c32750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 03 00 add (%rax),%eax
2: 49 03 1e add (%r14),%rbx
5: 48 89 d8 mov %rbx,%rax
8: 48 c1 e8 03 shr $0x3,%rax
c: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
11: 84 c0 test %al,%al
13: 75 22 jne 0x37
15: 8b 03 mov (%rbx),%eax
17: 65 ff 0d 21 66 88 7e decl %gs:0x7e886621(%rip) # 0x7e88663f
1e: 74 10 je 0x30
20: 83 e0 04 and $0x4,%eax
23: c1 e8 02 shr $0x2,%eax
26: 5b pop %rbx
27: 41 5e pop %r14
* 29: 41 5f pop %r15 <-- trapping instruction
2b: e9 e7 e1 03 0a jmp 0xa03e217
30: e8 f2 20 85 ff call 0xff852127
35: eb e9 jmp 0x20
37: 89 d9 mov %ebx,%ecx
39: 80 e1 07 and $0x7,%cl
3c: 80 c1 03 add $0x3,%cl