syzbot


BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet

Status: upstream: reported C repro on 2022/06/30 02:55
Reported-by: syzbot+de7cba59cdb5cf50845d@syzkaller.appspotmail.com
First crash: 719d, last: 658d
Fix bisection: failed (error log, bisect log)
  
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet origin:lts-only C error 11 5d10h 466d 0/3 upstream: reported C repro on 2023/03/09 22:19
upstream INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet (4) batman 3 507d 632d 0/27 auto-obsoleted due to no activity on 2023/04/28 17:43
linux-4.19 BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet (2) 1 679d 679d 0/1 auto-obsoleted due to no activity on 2022/12/07 08:10
linux-4.19 BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet 1 1023d 1023d 0/1 auto-closed as invalid on 2021/12/28 02:54
linux-6.1 INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet (2) 5 8d02h 31d 0/3 upstream: reported on 2024/05/18 05:47
linux-6.1 INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet 3 236d 343d 0/3 auto-obsoleted due to no activity on 2024/02/02 20:15
upstream INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet (3) batman 2 738d 799d 0/27 auto-closed as invalid on 2022/09/09 16:10
upstream INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet (2) batman 6 889d 1082d 0/27 closed as invalid on 2022/02/08 10:00
upstream INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet batman 2 1209d 1213d 0/27 auto-closed as invalid on 2021/05/25 23:54
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/03/06 15:32 11m retest repro linux-4.14.y report log
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2022/10/13 02:13 0m bisect fix linux-4.14.y error job log (0)
2022/08/30 09:20 22m bisect fix linux-4.14.y job log (0) log
2022/07/30 02:55 25m bisect fix linux-4.14.y job log (0) log

Sample crash report:
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u4:3:977]
Modules linked in:
irq event stamp: 192001
hardirqs last  enabled at (192000): [<ffffffff812307db>] kvm_wait arch/x86/kernel/kvm.c:600 [inline]
hardirqs last  enabled at (192000): [<ffffffff812307db>] kvm_wait+0x14b/0x240 arch/x86/kernel/kvm.c:580
hardirqs last disabled at (192001): [<ffffffff874018ae>] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793
softirqs last  enabled at (182062): [<ffffffff86ecaa02>] spin_unlock_bh include/linux/spinlock.h:362 [inline]
softirqs last  enabled at (182062): [<ffffffff86ecaa02>] batadv_forw_packet_steal+0x112/0x180 net/batman-adv/send.c:587
softirqs last disabled at (182072): [<ffffffff86eeda1a>] spin_lock_bh include/linux/spinlock.h:322 [inline]
softirqs last disabled at (182072): [<ffffffff86eeda1a>] batadv_tt_local_commit_changes+0x1a/0x30 net/batman-adv/translation-table.c:3947
CPU: 0 PID: 977 Comm: kworker/u4:3 Not tainted 4.14.285-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
task: ffff8880b382c000 task.stack: ffff8880b3830000
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffff8880b3837b70 EFLAGS: 000002c2 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff11e1344 RBX: ffff8880b2c0d298 RCX: 1ffff11016705924
RDX: dffffc0000000000 RSI: ffff8880b382c900 RDI: ffff8880b382c884
RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286
R13: dffffc0000000000 R14: ffff8880b2c0d299 R15: ffffed10174869f8
FS:  0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ac6e9e028 CR3: 00000000a068b000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 kvm_wait arch/x86/kernel/kvm.c:600 [inline]
 kvm_wait+0x179/0x240 arch/x86/kernel/kvm.c:580
 pv_wait arch/x86/include/asm/paravirt.h:679 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:447 [inline]
 __pv_queued_spin_lock_slowpath+0x722/0x910 kernel/locking/qspinlock.c:465
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:52 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:90 [inline]
 do_raw_spin_lock+0x178/0x200 kernel/locking/spinlock_debug.c:113
 spin_lock_bh include/linux/spinlock.h:322 [inline]
 batadv_tt_local_commit_changes+0x1a/0x30 net/batman-adv/translation-table.c:3947
 batadv_iv_ogm_schedule_buff+0xcfb/0xf80 net/batman-adv/bat_iv_ogm.c:985
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1043 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1036 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x5a7/0x6f0 net/batman-adv/bat_iv_ogm.c:1861
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 1e 5b fa e9 4f ff ff ff 48 89 ef e8 0d 1e 5b fa eb 93 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 0f 00 2d 54 ad 63 00 fb f4 <c3> 90 0f 1f 44 00 00 0f 00 2d 44 ad 63 00 f4 c3 90 90 41 55 41 
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	5b                   	pop    %rbx
   1:	fa                   	cli
   2:	e9 4f ff ff ff       	jmpq   0xffffff56
   7:	48 89 ef             	mov    %rbp,%rdi
   a:	e8 0d 1e 5b fa       	callq  0xfa5b1e1c
   f:	eb 93                	jmp    0xffffffa4
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  21:	0f 00 2d 54 ad 63 00 	verw   0x63ad54(%rip)        # 0x63ad7c
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	c3                   	retq <-- trapping instruction
  2b:	90                   	nop
  2c:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  31:	0f 00 2d 44 ad 63 00 	verw   0x63ad44(%rip)        # 0x63ad7c
  38:	f4                   	hlt
  39:	c3                   	retq
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	41 55                	push   %r13
  3e:	41                   	rex.B

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/06/30 02:54 linux-4.14.y f051383ef03b 1434eec0 .config console log report syz C ci2-linux-4-14 BUG: soft lockup in batadv_iv_send_outstanding_bat_ogm_packet
* Struck through repros no longer work on HEAD.