bisecting fixing commit since 54b4fa6d39551639cb10664f6ac78b01993a1d7e
building syzkaller on c8d1cc20df5ca5d9ea437054720fa3cfdfa1f578
testing commit 54b4fa6d39551639cb10664f6ac78b01993a1d7e with gcc (GCC) 8.1.0
kernel signature: cd6ec8ad9628ff29a1a6e0fef23ee491209d5ea07ad55b99708995b4a864cfc3
all runs: crashed: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!
testing current HEAD 13d2ce42de8cb98ff952f8de6307f896203854c2
testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0
kernel signature: 1380d63df79bc20fb02ca424e5b410216a7fd160eb61ebe435712b594ad2a6e3
all runs: crashed: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!
revisions tested: 2, total time: 26m18.490516648s (build: 20m1.191469564s, test: 5m23.724241535s)
the crash still happens on HEAD
commit msg: Linux 4.19.163
crash: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
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
CPU: 0 PID: 7293 Comm: syz-executor.3 Not tainted 4.19.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dma_buf_release+0x2ec/0x570 drivers/dma-buf/dma-buf.c:68
Code: 85 36 02 00 00 48 8b bb c0 00 00 00 e8 5d 03 6f fd 48 89 df e8 75 5c a8 fd 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e8 2d ec 66 fd 48 8d bb 38 02 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff8881da2b7dd0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881d5f98040 RCX: 0000000000000004
RDX: 1ffff1103abf3037 RSI: 0000000000000000 RDI: ffff8881d5f981b8
RBP: ffff8881da2b7e08 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8881da2b7e18 R11: ffff8881f13894f0 R12: ffff8881d8b1a63c
R13: ffff8881f13894f0 R14: ffffffff87847aa0 R15: ffff8881f50d2220
FS:  0000000001a7d940(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2861ce7100 CR3: 00000001d5e97001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __fput+0x249/0x7f0 fs/file_table.c:278
 ____fput+0x9/0x10 fs/file_table.c:309
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x1a9/0x200 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4163e1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff5265aec0 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
Modules linked in:
---[ end trace e66a63ba3d97e60b ]---
RIP: 0010:dma_buf_release+0x2ec/0x570 drivers/dma-buf/dma-buf.c:68
Code: 85 36 02 00 00 48 8b bb c0 00 00 00 e8 5d 03 6f fd 48 89 df e8 75 5c a8 fd 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e8 2d ec 66 fd 48 8d bb 38 02 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff8881da2b7dd0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881d5f98040 RCX: 0000000000000004
RDX: 1ffff1103abf3037 RSI: 0000000000000000 RDI: ffff8881d5f981b8
RBP: ffff8881da2b7e08 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8881da2b7e18 R11: ffff8881f13894f0 R12: ffff8881d8b1a63c
R13: ffff8881f13894f0 R14: ffffffff87847aa0 R15: ffff8881f50d2220
FS:  0000000001a7d940(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2861ce7100 CR3: 00000001d5e97001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400