bisecting fixing commit since ac3a0c8472969a03c0496ae774b3a29eb26c8d5a
building syzkaller on 63a7334112fa63edb0c0a3f317d3d92135a6ead9
testing commit ac3a0c8472969a03c0496ae774b3a29eb26c8d5a with gcc (GCC) 8.1.0
kernel signature: c50c18f82f4de895daa443df68aab746ba98240f3ef0480f79ccffd3ec4b3ad7
run #0: crashed: general protection fault in hci_send_acl
run #1: crashed: BUG: unable to handle kernel paging request in hci_send_acl
run #2: crashed: general protection fault in hci_send_acl
run #3: crashed: general protection fault in hci_send_acl
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #9: crashed: general protection fault in __queue_work
testing current HEAD c85fb28b6f999db9928b841f63f1beeb3074eeca
testing commit c85fb28b6f999db9928b841f63f1beeb3074eeca with gcc (GCC) 8.1.0
kernel signature: 63184586ddad99b3520a23116d2bd7bca3e2b70538a930d1b8cabfbdb14f3d24
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #2: crashed: general protection fault in hci_send_acl
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #5: crashed: stack segment fault in hci_send_acl
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in hci_send_acl
run #9: crashed: general protection fault in hci_send_acl
revisions tested: 2, total time: 16m35.391081275s (build: 10m3.138098447s, test: 5m55.150580137s)
the crash still happens on HEAD
commit msg: Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
crash: general protection fault in hci_send_acl
general protection fault, probably for non-canonical address 0x5d6abcf302000101: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 8202 Comm: kworker/u5:1 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
RIP: 0010:hci_send_acl+0x20/0x160 net/bluetooth/hci_core.c:4174
Code: c3 66 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 49 89 f6 41 55 41 54 55 53 89 d3 0f b7 d2 48 83 ec 10 4c 8b 67 18 8b 46 74 <49> 8b ac 24 18 09 00 00 c7 46 74 00 00 00 00 29 46 70 c6 46 28 02
RSP: 0018:ffffc90002f87cd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88810e8da000
RDX: 0000000000000002 RSI: ffff88811e19ab00 RDI: ffff88810ef36180
RBP: 0000000000000004 R08: 00000000000000c0 R09: ffff88810e90dc00
R10: ffff88810ecba680 R11: ba30a47eabfdb9c2 R12: 5d6abcf302000101
R13: ffff88810e8eae11 R14: ffff88811e19ab00 R15: ffff88810ef36180
FS:  0000000000000000(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564dc80e36b8 CR3: 0000000122206000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 l2cap_send_move_chan_cfm_icid+0x46/0x70 net/bluetooth/l2cap_core.c:4916
 l2cap_move_fail net/bluetooth/l2cap_core.c:5400 [inline]
 l2cap_move_channel_rsp net/bluetooth/l2cap_core.c:5439 [inline]
 l2cap_bredr_sig_cmd net/bluetooth/l2cap_core.c:5718 [inline]
 l2cap_sig_channel net/bluetooth/l2cap_core.c:6417 [inline]
 l2cap_recv_frame+0xc2b/0x2b70 net/bluetooth/l2cap_core.c:7659
 hci_acldata_packet net/bluetooth/hci_core.c:4703 [inline]
 hci_rx_work+0x1d3/0x500 net/bluetooth/hci_core.c:4894
 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269
 worker_thread+0x38/0x380 kernel/workqueue.c:2415
 kthread+0x148/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
---[ end trace 355cc12161634b8c ]---
RIP: 0010:hci_send_acl+0x20/0x160 net/bluetooth/hci_core.c:4174
Code: c3 66 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 49 89 f6 41 55 41 54 55 53 89 d3 0f b7 d2 48 83 ec 10 4c 8b 67 18 8b 46 74 <49> 8b ac 24 18 09 00 00 c7 46 74 00 00 00 00 29 46 70 c6 46 28 02
RSP: 0018:ffffc90002f87cd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88810e8da000
RDX: 0000000000000002 RSI: ffff88811e19ab00 RDI: ffff88810ef36180
RBP: 0000000000000004 R08: 00000000000000c0 R09: ffff88810e90dc00
R10: ffff88810ecba680 R11: ba30a47eabfdb9c2 R12: 5d6abcf302000101
R13: ffff88810e8eae11 R14: ffff88811e19ab00 R15: ffff88810ef36180
FS:  0000000000000000(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9cc62f0008 CR3: 0000000123754000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400