Subject: [syzbot] [batman?] BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet

From: syzbot <[email-masked]>
Date: Mon, 08 Jul 2024 20:12:19 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    795c58e4c7fc Merge tag 'trace-v6.10-rc6' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11bf7976980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c950e46ec3ea637a
dashboard link: https://syzkaller.appspot.com/bug?extid=572f6e36bc6ee6f16762
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/393fdf1d08dd/disk-795c58e4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/724001a1b4be/vmlinux-795c58e4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1ede352392b0/bzImage-795c58e4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [kworker/u8:8:2833]
Modules linked in:
irq event stamp: 1708674
hardirqs last  enabled at (1708673): [<ffffffff81e178c0>] ___slab_alloc+0x870/0x1870 mm/slub.c:3577
hardirqs last disabled at (1708674): [<ffffffff8ae84a1e>] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043
softirqs last  enabled at (1708660): [<ffffffff8aa82f2d>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (1708660): [<ffffffff8aa82f2d>] batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:661 [inline]
softirqs last  enabled at (1708660): [<ffffffff8aa82f2d>] batadv_iv_ogm_schedule_buff+0x97d/0x1500 net/batman-adv/bat_iv_ogm.c:833
softirqs last disabled at (1708658): [<ffffffff8aa82ee3>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (1708658): [<ffffffff8aa82ee3>] batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:639 [inline]
softirqs last disabled at (1708658): [<ffffffff8aa82ee3>] batadv_iv_ogm_schedule_buff+0x933/0x1500 net/batman-adv/bat_iv_ogm.c:833
CPU: 0 PID: 2833 Comm: kworker/u8:8 Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:kfence_alloc include/linux/kfence.h:127 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:3986 [inline]
RIP: 0010:kmem_cache_alloc_noprof+0x1bd/0x2f0 mm/slub.c:4009
Code: 5d 41 5e 41 5f 5d e9 2d aa 2e 09 31 c9 e9 71 ff ff ff 41 8b 44 24 08 a8 82 0f 84 5b ff ff ff a8 08 41 0f 45 de e9 50 ff ff ff <8b> 05 fd b8 f4 0b 85 c0 0f 85 c0 fe ff ff 4c 89 e7 44 89 f6 44 89
RSP: 0018:ffffc90009717840 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000002120 RCX: 0000000000000000
RDX: 1ffffffff1bace70 RSI: 0000000000000028 RDI: ffff88802ba3b3c4
RBP: ffffc90009717888 R08: 00000000ffffffff R09: ffff8880250de500
R10: 0000000000000000 R11: 0000000000000004 R12: ffff88801544f8c0
R13: 0000000000002120 R14: 0000000000000028 R15: 00000000250de500
FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f64bd0ce2d8 CR3: 000000006623e000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 fill_pool+0x26b/0x5d0 lib/debugobjects.c:168
 debug_objects_fill_pool lib/debugobjects.c:615 [inline]
 __debug_object_init+0xf7/0x480 lib/debugobjects.c:627
 __init_work+0x4c/0x60 kernel/workqueue.c:678
 batadv_iv_ogm_aggregate_new+0x2dd/0x4a0 net/batman-adv/bat_iv_ogm.c:584
 batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:670 [inline]
 batadv_iv_ogm_schedule_buff+0x99b/0x1500 net/batman-adv/bat_iv_ogm.c:833
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x31e/0x8d0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x9c8/0x1b40 kernel/workqueue.c:3248
 process_scheduled_works kernel/workqueue.c:3329 [inline]
 worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 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 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112

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