Message-ID: <683f151a.050a0220.55ceb.0014.GAE@google.com>
Date: Tue, 03 Jun 2025 08:30:34 -0700
From: syzbot <syzbot+406cbe754deca9aeaa82@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in napi_disable

Hello,

syzbot found the following issue on:

HEAD commit:    d7fa1af5b33e Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=14c71170580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a
dashboard link: https://syzkaller.appspot.com/bug?extid=406cbe754deca9aeaa82
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/da97ad659b2c/disk-d7fa1af5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/659e123552a8/vmlinux-d7fa1af5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6ec5dbf4643e/Image-d7fa1af5.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+406cbe754deca9aeaa82@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 6666 at kernel/locking/mutex.c:580 __mutex_lock_common+0x1650/0x2190 kernel/locking/mutex.c:580
Modules linked in:
CPU: 0 UID: 0 PID: 6666 Comm: kworker/u8:4 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: netns cleanup_net
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mutex_lock_common+0x1650/0x2190 kernel/locking/mutex.c:580
lr : __mutex_lock_common+0x1650/0x2190 kernel/locking/mutex.c:580
sp : ffff80009bb27560
x29: ffff80009bb27720 x28: dfff800000000000 x27: ffff80009bb27640
x26: ffff700013764ec8 x25: 0000000000000000 x24: ffff80009bb27680
x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000
x20: 0000000000000000 x19: ffff0000d446ccd2 x18: 1fffe0003386aa76
x17: 0000000000000000 x16: ffff80008ad27e48 x15: ffff700011e740c0
x14: 1ffff00011e740c0 x13: 0000000000000004 x12: ffffffffffffffff
x11: ffff700011e740c0 x10: 0000000000ff0100 x9 : 120a1682c186fb00
x8 : 120a1682c186fb00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80009bb26eb8 x4 : ffff80008f415ba0 x3 : ffff800080548ef0
x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 __mutex_lock_common+0x1650/0x2190 kernel/locking/mutex.c:580 (P)
 __mutex_lock kernel/locking/mutex.c:746 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798
 netdev_lock include/linux/netdevice.h:2751 [inline]
 napi_disable+0x4c/0x84 net/core/dev.c:7238
 gro_cells_destroy+0xf4/0x374 net/core/gro_cells.c:116
 ip_tunnel_dev_free+0x20/0x38 net/ipv4/ip_tunnel.c:1102
 netdev_run_todo+0xb44/0xd24 net/core/dev.c:11300
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:157
 cleanup_net+0x574/0x9c0 net/core/net_namespace.c:650
 process_one_work+0x7e8/0x156c kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847
irq event stamp: 1642461
hardirqs last  enabled at (1642461): [<ffff80008addfa48>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (1642461): [<ffff80008addfa48>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194
hardirqs last disabled at (1642460): [<ffff80008addf878>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (1642460): [<ffff80008addf878>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162
softirqs last  enabled at (1641216): [<ffff800089102264>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (1641216): [<ffff800089102264>] netif_addr_unlock_bh include/linux/netdevice.h:4804 [inline]
softirqs last  enabled at (1641216): [<ffff800089102264>] dev_mc_flush+0x1b0/0x1f4 net/core/dev_addr_lists.c:1037
softirqs last disabled at (1641214): [<ffff800089102794>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
Unable to handle kernel paging request at virtual address ffff0000d446ccd2
KASAN: maybe wild-memory-access in range [0xfffc0006a2366690-0xfffc0006a2366697]
Mem abort info:
  ESR = 0x0000000096000021
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x21: alignment fault
Data abort info:
  ISV = 0, ISS = 0x00000021, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000002079fa000
[ffff0000d446ccd2] pgd=0000000000000000, p4d=180000023ffff403, pud=180000023f41b403, pmd=180000023f378403, pte=006800011446c707
Internal error: Oops: 0000000096000021 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6666 Comm: kworker/u8:4 Tainted: G        W           6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: netns cleanup_net
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __lse__cmpxchg_case_acq_64 arch/arm64/include/asm/atomic_lse.h:272 [inline]
pc : __cmpxchg_case_acq_64 arch/arm64/include/asm/cmpxchg.h:121 [inline]
pc : __cmpxchg_acq arch/arm64/include/asm/cmpxchg.h:169 [inline]
pc : raw_atomic64_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:4181 [inline]
pc : raw_atomic64_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:4299 [inline]
pc : raw_atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-long.h:1482 [inline]
pc : atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4458 [inline]
pc : __mutex_trylock_common+0x178/0x258 kernel/locking/mutex.c:112
lr : instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
lr : atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4457 [inline]
lr : __mutex_trylock_common+0x16c/0x258 kernel/locking/mutex.c:112
sp : ffff80009bb27480
x29: ffff80009bb27500 x28: ffff0000d9f59e80 x27: ffff80009bb274a0
x26: 1ffff00013764e94 x25: dfff800000000000 x24: ffff0000d9f59e80
x23: 1ffff00012dee370 x22: ffff80008f32136c x21: ffff0000d9f59e80
x20: ffff0000d446ccd2 x19: 0000000000000000 x18: 1fffe0003386aa76
x17: 0000000000000000 x16: ffff800080514f0c x15: 0000000000000001
x14: 1ffff00013764e98 x13: 0000000000000000 x12: 0000000000000000
x11: ffff700013764e99 x10: dfff800000000000 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000001 x6 : ffff8000890d4c0c
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800080515078
x2 : 0000000000000001 x1 : 0000000000000008 x0 : 0000000000000001
Call trace:
 __lse__cmpxchg_case_acq_64 arch/arm64/include/asm/atomic_lse.h:272 [inline] (P)
 __cmpxchg_case_acq_64 arch/arm64/include/asm/cmpxchg.h:121 [inline] (P)
 __cmpxchg_acq arch/arm64/include/asm/cmpxchg.h:169 [inline] (P)
 raw_atomic64_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:4181 [inline] (P)
 raw_atomic64_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:4299 [inline] (P)
 raw_atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-long.h:1482 [inline] (P)
 atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4458 [inline] (P)
 __mutex_trylock_common+0x178/0x258 kernel/locking/mutex.c:112 (P)
 __mutex_trylock kernel/locking/mutex.c:135 [inline]
 __mutex_lock_common+0x1e8/0x2190 kernel/locking/mutex.c:604
 __mutex_lock kernel/locking/mutex.c:746 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798
 netdev_lock include/linux/netdevice.h:2751 [inline]
 napi_disable+0x4c/0x84 net/core/dev.c:7238
 gro_cells_destroy+0xf4/0x374 net/core/gro_cells.c:116
 ip_tunnel_dev_free+0x20/0x38 net/ipv4/ip_tunnel.c:1102
 netdev_run_todo+0xb44/0xd24 net/core/dev.c:11300
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:157
 cleanup_net+0x574/0x9c0 net/core/net_namespace.c:650
 process_one_work+0x7e8/0x156c kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847
Code: 941c570a f94023e9 d503201f aa0903e8 (c8e87e95) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	941c570a 	bl	0x715c28
   4:	f94023e9 	ldr	x9, [sp, #64]
   8:	d503201f 	nop
   c:	aa0903e8 	mov	x8, x9
* 10:	c8e87e95 	casa	x8, x21, [x20] <-- trapping instruction


---
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