bisecting fixing commit since c98875d930e915d01e8c40c7d3c16f00b3c8abe1
building syzkaller on 53199d6e8aee5f0ebd3775d2b1c674f4e6e64e2b
testing commit c98875d930e915d01e8c40c7d3c16f00b3c8abe1 with gcc (GCC) 8.4.1 20210217
kernel signature: 2384b2413b3e30009dac5642db10b433f0d691ed362df34bf90adec2c3731eaf
run #0: crashed: general protection fault in skb_put
run #1: crashed: general protection fault in skb_put
run #2: crashed: general protection fault in skb_put
run #3: crashed: general protection fault in skb_put
run #4: crashed: general protection fault in skb_put
run #5: crashed: general protection fault in skb_put
run #6: crashed: general protection fault in corrupted
run #7: crashed: general protection fault in skb_put
run #8: crashed: general protection fault in skb_put
run #9: crashed: general protection fault in skb_put
run #10: crashed: general protection fault in skb_put
run #11: crashed: general protection fault in corrupted
run #12: crashed: general protection fault in skb_put
run #13: crashed: general protection fault in skb_put
run #14: crashed: general protection fault in corrupted
run #15: crashed: general protection fault in skb_put
run #16: crashed: general protection fault in skb_put
run #17: crashed: general protection fault in skb_put
run #18: crashed: general protection fault in corrupted
run #19: crashed: general protection fault in skb_put
testing current HEAD 030194a5b292bb7613407668d85af0b987bb9839
testing commit 030194a5b292bb7613407668d85af0b987bb9839 with gcc (GCC) 8.4.1 20210217
kernel signature: 328d632615f28ff099541d67386e30f8f6e50521585067093aca78067357f6e8
all runs: crashed: general protection fault in skb_put
revisions tested: 2, total time: 23m59.546273236s (build: 16m49.270446318s, test: 6m14.308236661s)
the crash still happens on HEAD
commit msg: Linux 4.19.180
crash: general protection fault in skb_put
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000003 R14: 00000000004ae997 R15: 00007f3f87aec6bc
Bluetooth: Can't allocate mem for new packet
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
RIP: 0010:skb_put+0x28/0x1e0 net/core/skbuff.c:1706
Code: 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 4c 8d af c8 00 00 00 41 54 4c 89 ea 53 48 89 fb 48 c1 ea 03 48 83 ec 10 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 28
RSP: 0018:ffff8881f56b7a88 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8881e15223dc
RDX: 0000000000000019 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881f56b7ab0 R08: ffffed103ed24733 R09: ffffed103ed24732
R10: ffffed103ed24732 R11: ffff8881f6923993 R12: ffff8881cf67206a
R13: 00000000000000c8 R14: ffff8881e1522280 R15: ffff8881e1522378
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd120804000 CR3: 000000000806d004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 skb_put_data include/linux/skbuff.h:2128 [inline]
 bcsp_unslip_one_byte drivers/bluetooth/hci_bcsp.c:451 [inline]
 bcsp_recv+0x9bb/0x1650 drivers/bluetooth/hci_bcsp.c:613
 hci_uart_tty_receive+0x1d4/0x470 drivers/bluetooth/hci_ldisc.c:621
 tty_ldisc_receive_buf+0x103/0x1c0 drivers/tty/tty_buffer.c:460
 tty_port_default_receive_buf+0x5f/0x90 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:476 [inline]
 flush_to_ldisc+0x1af/0x3a0 drivers/tty/tty_buffer.c:528
 process_one_work+0x835/0x1670 kernel/workqueue.c:2152
 worker_thread+0x85/0xb60 kernel/workqueue.c:2295
 kthread+0x34a/0x410 kernel/kthread.c:259
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 75801f6efc49af27 ]---
RIP: 0010:skb_put+0x28/0x1e0 net/core/skbuff.c:1706
Code: 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 4c 8d af c8 00 00 00 41 54 4c 89 ea 53 48 89 fb 48 c1 ea 03 48 83 ec 10 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 28
RSP: 0018:ffff8881f56b7a88 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8881e15223dc
RDX: 0000000000000019 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8881f56b7ab0 R08: ffffed103ed24733 R09: ffffed103ed24732
R10: ffffed103ed24732 R11: ffff8881f6923993 R12: ffff8881cf67206a
R13: 00000000000000c8 R14: ffff8881e1522280 R15: ffff8881e1522378
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd120804000 CR3: 000000000806d004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400