Oops: general protection fault, probably for non-canonical address 0xdffffc000000004b: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000258-0x000000000000025f] CPU: 1 UID: 0 PID: 6041 Comm: kworker/1:5 Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events l2cap_info_timeout RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:199 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 fe cb 60 09 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc90003fffa00 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000258 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8950f3b1 RDI: dffffc000000004b RBP: 0000000000000258 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000ffffff80 R11: 0000000000000001 R12: ffffffff8950f3b1 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124852000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3305ffff CR3: 0000000033491000 CR4: 00000000003526f0 Call Trace: __kasan_check_byte+0x13/0x50 mm/kasan/common.c:556 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire kernel/locking/lockdep.c:5845 [inline] lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5828 lock_sock_nested+0x41/0xf0 net/core/sock.c:3752 lock_sock include/net/sock.h:1667 [inline] l2cap_sock_ready_cb+0x41/0x170 net/bluetooth/l2cap_sock.c:1674 l2cap_chan_ready net/bluetooth/l2cap_core.c:1246 [inline] l2cap_conn_start+0x144/0xb30 net/bluetooth/l2cap_core.c:1512 l2cap_info_timeout+0x81/0xa0 net/bluetooth/l2cap_core.c:1669 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:199 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 fe cb 60 09 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc90003fffa00 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000258 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8950f3b1 RDI: dffffc000000004b RBP: 0000000000000258 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000ffffff80 R11: 0000000000000001 R12: ffffffff8950f3b1 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124852000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555e72a808 CR3: 0000000028e37000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 0f 1f 00 nopl (%rax) 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 66 0f 1f 00 nopw (%rax) 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 c1 ef 03 shr $0x3,%rdi 27: 48 01 c7 add %rax,%rdi * 2a: 0f b6 07 movzbl (%rdi),%eax <-- trapping instruction 2d: 3c 07 cmp $0x7,%al 2f: 0f 96 c0 setbe %al 32: e9 fe cb 60 09 jmp 0x960cc35 37: 66 data16 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax)