Dear Linux Developer, Recently when using our tool to fuzz kernel, the following crash was triggered. A similar patch https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=d5ebaa7c5f6f688959e8d40840b2249ede63b8ed is applied but kernel persists. HEAD commit: 4fe89d07d Linux 6.0 git tree: upstream compiler: clang 12.0.0 console output: https://drive.google.com/file/d/1mXSQ5T1XpV7jcrxa8nM3XMchyWuY8i01/view?usp=share_link kernel config: https://drive.google.com/file/d/1ZHRxVTXHL9mENdAPmQYS1DtgbflZ9XsD/view?usp=share_link C reproducer: https://drive.google.com/file/d/1iaLcMGNX6pL_x0-3Tag_0Qipdr4FrfMN/view?usp=share_link Syz reproducer: https://drive.google.com/file/d/15pVBa8YaBuinmQZrxkA1Wx5n8yb4xoo8/view?usp=share_link IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: Wei Chen <harperchen1110@xxxxxxxxx> Bluetooth: hci0: hardware error 0x00 general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 0 PID: 51 Comm: kworker/u7:0 Not tainted 6.0.0 #35 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: hci0 hci_error_reset RIP: 0010:klist_next+0x4a/0x330 lib/klist.c:377 Code: 4c 89 e8 48 c1 e8 03 48 89 44 24 08 42 80 3c 20 00 74 08 4c 89 ef e8 65 77 7d fd 49 8b 5d 00 48 8d 6b 58 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 47 77 7d fd 48 8b 6d 00 4d 8d 75 RSP: 0018:ffffc90000a979c0 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000000 RCX: ffff8880428a2440 RDX: 0000000000000000 RSI: ffffc90000a97a60 RDI: ffffc90000a97a60 RBP: 0000000000000058 R08: ffffffff89442273 R09: ffffffff893b7dec R10: 0000000000000002 R11: ffff8880428a2440 R12: dffffc0000000000 R13: ffffc90000a97a60 R14: ffff88801f45c000 R15: ffffffff89442390 FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f16fc4ac000 CR3: 0000000018532000 CR4: 0000000000752ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> next_device drivers/base/core.c:3756 [inline] device_find_child+0xb0/0x1c0 drivers/base/core.c:3899 hci_conn_del_sysfs+0x8c/0x180 net/bluetooth/hci_sysfs.c:71 hci_conn_cleanup+0x599/0x750 net/bluetooth/hci_conn.c:147 hci_conn_del+0x2ae/0x3b0 net/bluetooth/hci_conn.c:1022 hci_conn_hash_flush+0x1bd/0x240 net/bluetooth/hci_conn.c:2367 hci_dev_close_sync+0x742/0xd30 net/bluetooth/hci_sync.c:4476 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_error_reset+0xdb/0x1d0 net/bluetooth/hci_core.c:1050 process_one_work+0x83c/0x11a0 kernel/workqueue.c:2289 worker_thread+0xa6c/0x1290 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:klist_next+0x4a/0x330 lib/klist.c:377 Code: 4c 89 e8 48 c1 e8 03 48 89 44 24 08 42 80 3c 20 00 74 08 4c 89 ef e8 65 77 7d fd 49 8b 5d 00 48 8d 6b 58 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 47 77 7d fd 48 8b 6d 00 4d 8d 75 RSP: 0018:ffffc90000a979c0 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000000 RCX: ffff8880428a2440 RDX: 0000000000000000 RSI: ffffc90000a97a60 RDI: ffffc90000a97a60 RBP: 0000000000000058 R08: ffffffff89442273 R09: ffffffff893b7dec R10: 0000000000000002 R11: ffff8880428a2440 R12: dffffc0000000000 R13: ffffc90000a97a60 R14: ffff88801f45c000 R15: ffffffff89442390 FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f16fc4ac000 CR3: 0000000018532000 CR4: 0000000000752ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: 4c 89 e8 mov %r13,%rax 3: 48 c1 e8 03 shr $0x3,%rax 7: 48 89 44 24 08 mov %rax,0x8(%rsp) c: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 11: 74 08 je 0x1b 13: 4c 89 ef mov %r13,%rdi 16: e8 65 77 7d fd callq 0xfd7d7780 1b: 49 8b 5d 00 mov 0x0(%r13),%rbx 1f: 48 8d 6b 58 lea 0x58(%rbx),%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 47 77 7d fd callq 0xfd7d7780 39: 48 8b 6d 00 mov 0x0(%rbp),%rbp 3d: 4d rex.WRB 3e: 8d .byte 0x8d 3f: 75 .byte 0x75 Best, Wei
