------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 6315 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4773 [inline] WARNING: CPU: 1 PID: 6315 at kernel/locking/lockdep.c:232 __lock_acquire+0x78c/0x763c kernel/locking/lockdep.c:5087 Modules linked in: CPU: 1 PID: 6315 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4773 [inline] pc : __lock_acquire+0x78c/0x763c kernel/locking/lockdep.c:5087 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4773 [inline] lr : __lock_acquire+0x780/0x763c kernel/locking/lockdep.c:5087 sp : ffff800097de6b20 x29: ffff800097de6de0 x28: ffff0000d9638000 x27: ffff0000d9638b18 x26: 1fffe0001b2c7163 x25: ffff0000d9638a58 x24: 0000000000000001 x23: 0000000000000004 x22: 000000000000075c x21: ffff800092236428 x20: 0000000000000000 x19: ffff0000d9638b1c x18: 1fffe00036804396 x17: 0000000000000000 x16: ffff80008ad6b09c x15: 0000000000000001 x14: 1fffe00036804402 x13: 0000000000000000 x12: dfff800000000000 x11: 0000000000000002 x10: 0000000000ff0100 x9 : 4b84d64703162200 x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800097de6418 x4 : ffff80008ed822c0 x3 : ffff8000805ba130 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4773 [inline] __lock_acquire+0x78c/0x763c kernel/locking/lockdep.c:5087 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __flush_workqueue+0x14c/0x11c4 kernel/workqueue.c:3146 nci_close_device+0x140/0x5b8 net/nfc/nci/core.c:567 nci_dev_down+0x40/0x54 net/nfc/nci/core.c:639 nfc_dev_down+0x164/0x250 net/nfc/core.c:161 nfc_genl_dev_down+0x98/0xdc net/nfc/netlink.c:791 genl_family_rcv_msg_doit net/netlink/genetlink.c:1113 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1193 [inline] genl_rcv_msg+0x874/0xb6c net/netlink/genetlink.c:1208 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1217 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 963 hardirqs last enabled at (963): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1397 [inline] hardirqs last enabled at (963): [] finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5154 hardirqs last disabled at (962): [] __schedule+0x2bc/0x24b4 kernel/sched/core.c:6625 softirqs last enabled at (946): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (944): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Unable to handle kernel paging request at virtual address dfff800000000018 KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000018] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 6315 Comm: syz-executor.0 Tainted: G W 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4773 [inline] pc : __lock_acquire+0x568/0x763c kernel/locking/lockdep.c:5087 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4773 [inline] lr : __lock_acquire+0x780/0x763c kernel/locking/lockdep.c:5087 sp : ffff800097de6b20 x29: ffff800097de6de0 x28: ffff0000d9638000 x27: ffff0000d9638b18 x26: 1fffe0001b2c7163 x25: ffff0000d9638a58 x24: 0000000000000001 x23: 0000000000000004 x22: 000000000000075c x21: ffff800092236428 x20: 0000000000000000 x19: 00000000000000c4 x18: 1fffe00036804396 x17: 0000000000000000 x16: ffff80008ad6b09c x15: 0000000000000001 x14: 1fffe00036804402 x13: 0000000000000000 x12: dfff800000000000 x11: 0000000000000002 x10: 0000000000ff0100 x9 : 4b84d64703162200 x8 : 0000000000000018 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800097de6418 x4 : ffff80008ed822c0 x3 : ffff8000805ba130 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4773 [inline] __lock_acquire+0x568/0x763c kernel/locking/lockdep.c:5087 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __flush_workqueue+0x14c/0x11c4 kernel/workqueue.c:3146 nci_close_device+0x140/0x5b8 net/nfc/nci/core.c:567 nci_dev_down+0x40/0x54 net/nfc/nci/core.c:639 nfc_dev_down+0x164/0x250 net/nfc/core.c:161 nfc_genl_dev_down+0x98/0xdc net/nfc/netlink.c:791 genl_family_rcv_msg_doit net/netlink/genetlink.c:1113 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1193 [inline] genl_rcv_msg+0x874/0xb6c net/netlink/genetlink.c:1208 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1217 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Code: 34000ee8 aa1f03e8 91031113 d343fe68 (38ec6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000ee8 cbz w8, 0x1dc 4: aa1f03e8 mov x8, xzr 8: 91031113 add x19, x8, #0xc4 c: d343fe68 lsr x8, x19, #3 * 10: 38ec6908 ldrsb w8, [x8, x12] <-- trapping instruction