bisecting fixing commit since c37da90efff5f183bea6ae4c2af33571f61fe317 building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7 testing commit c37da90efff5f183bea6ae4c2af33571f61fe317 with gcc (GCC) 8.1.0 kernel signature: bef1d8fffc337100aeb73c65d1648b18982a974cc7f120760651fe3eb8366a8f run #0: crashed: WARNING in hci_conn_timeout run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in corrupted run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in hci_conn_timeout run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in hci_conn_timeout run #9: crashed: WARNING in hci_conn_timeout testing current HEAD daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b testing commit daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b with gcc (GCC) 8.1.0 kernel signature: 54fb903d5bb845f8cc7fefe72ff35fc430810b73f8f0845cd5f154f49156ea73 run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in hci_conn_timeout run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in corrupted run #4: crashed: WARNING in hci_conn_timeout run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in corrupted revisions tested: 2, total time: 28m46.029262542s (build: 18m42.809404449s, test: 9m27.672260317s) the crash still happens on HEAD commit msg: Linux 4.19.161 crash: WARNING in corrupted ------------[ cut here ]------------ ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5952 at net/bluetooth/hci_conn.c:404 hci_conn_timeout.cold.5+0xc/0x13 net/bluetooth/hci_conn.c:404 WARNING: CPU: 1 PID: 5948 at net/bluetooth/hci_conn.c:404 hci_conn_timeout.cold.5+0xc/0x13 net/bluetooth/hci_conn.c:404 Kernel panic - not syncing: panic_on_warn set ... Modules linked in: CPU: 0 PID: 5952 Comm: kworker/u5:7 Not tainted 4.19.161-syzkaller #0 CPU: 1 PID: 5948 Comm: kworker/u5:3 Not tainted 4.19.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci5 hci_conn_timeout Workqueue: hci1 hci_conn_timeout Call Trace: RIP: 0010:hci_conn_timeout.cold.5+0xc/0x13 net/bluetooth/hci_conn.c:404 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x22a lib/dump_stack.c:118 Code: 89 55 d0 e8 5f af 6e fb 48 8b 55 d0 e9 7e fe ff ff 4c 89 f7 e8 4e af 6e fb e9 3e fe ff ff 48 c7 c7 00 4d cd 87 e8 7d 40 2b fb <0f> 0b e9 bf 61 ff ff e8 c1 95 6e fb 48 c7 c7 c0 52 cd 87 e8 05 4a RSP: 0018:ffff8881d0fe7d40 EFLAGS: 00010286 panic+0x1cd/0x375 kernel/panic.c:186 RAX: 0000000000000024 RBX: ffff8881e3f0ea60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87678560 RDI: ffffffff8a19ca60 RBP: ffff8881d0fe7d58 R08: ffffed103ed25081 R09: ffffed103ed25080 __warn.cold.7+0x1b/0x3e kernel/panic.c:541 R10: ffffed103ed25080 R11: ffff8881f6928407 R12: ffff8881e3f0e940 R13: ffff8881f28eed80 R14: ffff8881dc5d7400 R15: ffff8881e3f0ea60 FS: 0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 report_bug+0x1a4/0x200 lib/bug.c:186 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001d8aa98 CR3: 000000000846d005 CR4: 00000000001606e0 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2155 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 worker_thread+0x85/0xb60 kernel/workqueue.c:2298 RIP: 0010:hci_conn_timeout.cold.5+0xc/0x13 net/bluetooth/hci_conn.c:404 Code: 89 55 d0 e8 5f af 6e fb 48 8b 55 d0 e9 7e fe ff ff 4c 89 f7 e8 4e af 6e fb e9 3e fe ff ff 48 c7 c7 00 4d cd 87 e8 7d 40 2b fb <0f> 0b e9 bf 61 ff ff e8 c1 95 6e fb 48 c7 c7 c0 52 cd 87 e8 05 4a kthread+0x347/0x410 kernel/kthread.c:259 RSP: 0018:ffff8881e3eafd40 EFLAGS: 00010286 RAX: 0000000000000024 RBX: ffff8881e3fd4c20 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87678560 RDI: ffffffff8a19ca60 RBP: ffff8881e3eafd58 R08: ffffed103ed05081 R09: ffffed103ed05080 R10: ffffed103ed05080 R11: ffff8881f6828407 R12: ffff8881e3fd4b00 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 R13: ffff8881f28eed80 R14: ffff8881d542ec00 R15: ffff8881e3fd4c20 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2155 irq event stamp: 341184 hardirqs last enabled at (341183): [] console_unlock+0xb9e/0xe20 kernel/printk/printk.c:2464 hardirqs last disabled at (341184): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (331280): [] __do_softirq+0x643/0x92d kernel/softirq.c:318 softirqs last disabled at (331257): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (331257): [] irq_exit+0x17f/0x1c0 kernel/softirq.c:412 ---[ end trace 2777d3b5872a5585 ]--- worker_thread+0x85/0xb60 kernel/workqueue.c:2298 ------------[ cut here ]------------ kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Kernel Offset: disabled Rebooting in 86400 seconds..