[syzbot] [net?] WARNING in napi_disable
From: syzbot <hidden>
Date: 2025-06-03 15:30:38
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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@syzkaller.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 --- This 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