Extracting prog: 53.648892169s Minimizing prog: 5m2.947829821s Simplifying prog options: 2m13.607882454s Extracting C: 35.024802513s Simplifying C: 5m6.862507568s extracting reproducer from 24 programs first checking the prog from the crash report single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-memfd_create-pwritev-ioctl$LOOP_CHANGE_FD-ioctl$LOOP_SET_STATUS detailed listing: executing program 0: r0 = syz_open_dev$loop(&(0x7f0000000140), 0x75f, 0xa382) r1 = memfd_create(&(0x7f0000000880)='C\x13\xfc2\x95WD\xaa\xba^\x90\xfd\x8d\xc2\xb1[\x81\xda\xda\xd6\x8c\xc99\xec\x0e*||\xe4\xb3\xc4\xb6\v\xaa\x15\x86,\xac\x8d\x89cu\x10\xdc\x93\x9b\xb4\x93\xafE*:\xe4\xdd\xa5\xa75\xb8\x1e;7\xb7.V\xdcrw[\r\x98\x93j\x9c\xf6\xf8\x99\xefF_\xcd\xdf!b\xc5\xec\ntb\xff\b\xaaF?!\x9f\a\x1a\x03\f\xe94\x1deU\x06zS\xc90\xb9voI\xa5/\xb4\xa7@\xa1\\B\xc2@\r_b\x9a\xeb\b\x81\x00V\xd6/N\xc5\xc6f\xb1\x95Z\xe5w^\xd8\xe7J\x80\xf7\xae\xafuv\x84\x9eG\xd1\xe7\x9b\xf0_9\xc2\x9b\xfd\xc3\xf3\xe4\x95P\xf1m\xcf\xc2\xe1\xe6\xa6\x8c\x11\xfb\xb8S\x8b\x92\\\asW-Ee\x02\x00\x00\x00\xd0;Q\xc1~\x89\xec\xc8\x9b\x88\a\xf2\x93\x82(\x8b\x00\xd8\xb4T\x80\x95\x93\x9c5\xcf\t\x04\x00\x00\x00\x00\x00\x00v\xef\xee+\xab\x9c\x00^R\xb2n?i=\xbe\x16\x8a\xbf\xe3\xcdB\xed\xe14\xe8\xd0\xb7\xff\xfeQ\x1c\x85n8\x1b\xc1\b\x00\x00\x00\x00\x00\x00\x00\x17\x94\xdfW\x92z\xbe\xb2R)\xf1K\xd7\xaf\x99\xf6d\xe8\xec\xb7\xbd+T3\xa6\xa9\xfaY-1qs\x82\xefn*\x96\xc9\x1e\xf4\xd1\x02Dt\xc0\x19\xf7\x89\x96.D [F\xeeYW\x95\x13\xc7;\x94\x13^\x13\xaf\xf0C\x9c\xabf\x1daCS2\x02\xb0\xef\xc7\x8c\x9e\xed\a\n\x92z\xbe\xb2R)\xf1K\xd7\xaf\x99\xf6d\xe8\xec\xb7\xbd+T3\xa6\xa9\xfaY-1qs\x82\xefn*\x96\xc9\x1e\xf4\xd1\x02Dt\xc0\x19\xf7\x89\x96.D [F\xeeYW\x95\x13\xc7;\x94\x13^\x13\xaf\xf0C\x9c\xabf\x1daCS2\x02\xb0\xef\xc7\x8c\x9e\xed\a\n\x92z\xbe\xb2R)\xf1K\xd7\xaf\x99\xf6d\xe8\xec\xb7\xbd+T3\xa6\xa9\xfaY-1qs\x82\xefn*\x96\xc9\x1e\xf4\xd1\x02Dt\xc0\x19\xf7\x89\x96.D [F\xeeYW\x95\x13\xc7;\x94\x13^\x13\xaf\xf0C\x9c\xabf\x1daCS2\x02\xb0\xef\xc7\x8c\x9e\xed\a\nlock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: netif_napi_add_weight include/linux/netdevice.h:2783 [inline] ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_new_device drivers/net/wan/lapbether.c:415 [inline] ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_device_event+0x586/0xbe0 drivers/net/wan/lapbether.c:460 but task is already holding lock: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:39 [inline] ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0xa7/0x250 net/core/dev_api.c:67 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&dev->lock); lock(&dev->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by dhcpcd/5648: #0: ffffffff900fb268 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff900fb268 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x26d/0x1f50 net/ipv4/devinet.c:1121 #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:39 [inline] #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0xa7/0x250 net/core/dev_api.c:67 stack backtrace: CPU: 1 UID: 0 PID: 5648 Comm: dhcpcd Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain kernel/locking/lockdep.c:3896 [inline] __lock_acquire+0xff7/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:587 [inline] __mutex_lock+0x19a/0xb00 kernel/locking/mutex.c:732 netdev_lock include/linux/netdevice.h:2751 [inline] netif_napi_add_weight include/linux/netdevice.h:2783 [inline] lapbeth_new_device drivers/net/wan/lapbether.c:415 [inline] lapbeth_device_event+0x586/0xbe0 drivers/net/wan/lapbether.c:460 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2180 call_netdevice_notifiers_extack net/core/dev.c:2218 [inline] call_netdevice_notifiers net/core/dev.c:2232 [inline] __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9409 netif_change_flags+0x108/0x160 net/core/dev.c:9438 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200 inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0x115/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd2ae872d49 Code: 5c c3 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 76 10 48 8b 15 ae 60 0d 00 f7 d8 41 83 c8 RSP: 002b:00007ffe95adcd68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd2ae7a46c0 RCX: 00007fd2ae872d49 RDX: 00007ffe95aecf58 RSI: 0000000000008914 RDI: 000000000000001b RBP: 00007ffe95afd118 R08: 00007ffe95aecf18 R09: 00007ffe95aecec8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe95aecf58 R14: 0000000000000028 R15: 0000000000008914 final repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected 6.14.0-syzkaller-05877-g1a9239bb4253 #0 Not tainted -------------------------------------------- dhcpcd/5648 is trying to acquire lock: ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: netif_napi_add_weight include/linux/netdevice.h:2783 [inline] ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_new_device drivers/net/wan/lapbether.c:415 [inline] ffff8880246b0d28 (&dev->lock){+.+.}-{4:4}, at: lapbeth_device_event+0x586/0xbe0 drivers/net/wan/lapbether.c:460 but task is already holding lock: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:39 [inline] ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0xa7/0x250 net/core/dev_api.c:67 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&dev->lock); lock(&dev->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by dhcpcd/5648: #0: ffffffff900fb268 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff900fb268 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x26d/0x1f50 net/ipv4/devinet.c:1121 #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:39 [inline] #1: ffff888029c80d28 (&dev->lock){+.+.}-{4:4}, at: dev_change_flags+0xa7/0x250 net/core/dev_api.c:67 stack backtrace: CPU: 1 UID: 0 PID: 5648 Comm: dhcpcd Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain kernel/locking/lockdep.c:3896 [inline] __lock_acquire+0xff7/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:587 [inline] __mutex_lock+0x19a/0xb00 kernel/locking/mutex.c:732 netdev_lock include/linux/netdevice.h:2751 [inline] netif_napi_add_weight include/linux/netdevice.h:2783 [inline] lapbeth_new_device drivers/net/wan/lapbether.c:415 [inline] lapbeth_device_event+0x586/0xbe0 drivers/net/wan/lapbether.c:460 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2180 call_netdevice_notifiers_extack net/core/dev.c:2218 [inline] call_netdevice_notifiers net/core/dev.c:2232 [inline] __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9409 netif_change_flags+0x108/0x160 net/core/dev.c:9438 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200 inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0x115/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd2ae872d49 Code: 5c c3 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 76 10 48 8b 15 ae 60 0d 00 f7 d8 41 83 c8 RSP: 002b:00007ffe95adcd68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd2ae7a46c0 RCX: 00007fd2ae872d49 RDX: 00007ffe95aecf58 RSI: 0000000000008914 RDI: 000000000000001b RBP: 00007ffe95afd118 R08: 00007ffe95aecf18 R09: 00007ffe95aecec8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe95aecf58 R14: 0000000000000028 R15: 0000000000008914