bisecting fixing commit since 01364dad1d4577e27a57729d41053f661bb8a5b9
building syzkaller on e8e6c7d21dbd86f502f66737883b1a0c3ae8eeb1
testing commit 01364dad1d4577e27a57729d41053f661bb8a5b9 with gcc (GCC) 8.1.0
kernel signature: bc73aaa4bbbcadf7b97813608c06b0ad7e1eeb2ffa18a952ad94d1678ea168eb
all runs: crashed: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!
testing current HEAD 050272a0423e68207fd2367831ae610680129062
testing commit 050272a0423e68207fd2367831ae610680129062 with gcc (GCC) 8.1.0
kernel signature: 9b2ef1d2be90dab17d578934984c810ab7969cf7fedd2f0e3f6d5ca438de7e60
all runs: crashed: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!
revisions tested: 2, total time: 24m52.23985478s (build: 17m43.577385242s, test: 6m17.478045623s)
the crash still happens on HEAD
commit msg: Linux 4.14.177
crash: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!
batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
------------[ cut here ]------------
kernel BUG at drivers/dma-buf/dma-buf.c:68!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 9412 Comm: syz-executor.5 Not tainted 4.14.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888077ca2140 task.stack: ffff888077ca8000
RIP: 0010:dma_buf_release+0x2e0/0x560 drivers/dma-buf/dma-buf.c:68
RSP: 0018:ffff888077cafda0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a0946900 RCX: 1ffffffff0e3f586
RDX: 1ffff11014128d4f RSI: ffff8880a8698540 RDI: ffff8880a0946a78
RBP: ffff888077cafdd8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88821985a970 R12: ffff88821985a970
R13: ffff8880a8698558 R14: ffff8880a8698540 R15: ffff8880a8698568
FS:  0000000002516940(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000076c000 CR3: 00000000a12d4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __fput+0x232/0x750 fs/file_table.c:210
 ____fput+0x9/0x10 fs/file_table.c:244
 task_work_run+0xe5/0x170 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x16a/0x1b0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4163e1
RSP: 002b:00007ffccfc74980 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 00000000004163e1
RDX: 0000000000000000 RSI: 0000000000000081 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 01ffffffffffffff
R10: 00000000007708c0 R11: 0000000000000293 R12: 000000000076bf00
R13: 00000000007708d0 R14: 0000000000000000 R15: 000000000076bf0c
Code: 0f 85 2c 02 00 00 48 8b bb c0 00 00 00 e8 e9 73 9c fd 48 89 df e8 11 18 ce fd 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e8 e9 a0 95 fd 48 8d bb 38 02 00 00 48 b8 00 00 00 00 00 
RIP: dma_buf_release+0x2e0/0x560 drivers/dma-buf/dma-buf.c:68 RSP: ffff888077cafda0
---[ end trace 36f7677604406a49 ]---