bisecting fixing commit since 54b4fa6d39551639cb10664f6ac78b01993a1d7e
building syzkaller on c8d1cc20df5ca5d9ea437054720fa3cfdfa1f578
testing commit 54b4fa6d39551639cb10664f6ac78b01993a1d7e with gcc (GCC) 8.4.1 20210217
kernel signature: b9d18b078207a65ead5684248ca5d7e1b0f1f48ad50436630cebc12fef11909e
all runs: crashed: kernel BUG in dma_buf_release
testing current HEAD 2965db2e004cf9c92b87c1f559e9812c0ae878c1
testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217
kernel signature: b4c560ea1168a4a1ac9f3b8e8d57785981130e458ffc8b589ee1137b18312cd4
all runs: crashed: kernel BUG in dma_buf_release
revisions tested: 2, total time: 28m48.189981291s (build: 21m39.267137135s, test: 6m39.41959909s)
the crash still happens on HEAD
commit msg: Linux 4.19.188
crash: kernel BUG in dma_buf_release
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
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: 7739 Comm: syz-executor.0 Not tainted 4.19.188-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 dd 7c 76 fd 48 89 df e8 35 5d af fd 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e8 1d ae 6e fd 48 8d bb 38 02 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff8881d5bffdd0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881ed011b00 RCX: 0000000000000004
RDX: 1ffff1103da0238f RSI: 0000000000000000 RDI: ffff8881ed011c78
RBP: ffff8881d5bffe08 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8881d5bffe18 R11: ffff8881f13984f0 R12: ffff8881f424f2fc
R13: ffff8881f13984f0 R14: ffffffff878494e0 R15: ffff8881f57c0220
FS:  0000000000eb7400(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000053c000 CR3: 00000001efd3a001 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: 0033:0x41741b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007fff898960e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000041741b
RDX: ffffffffffffffbc RSI: 00000000005408c8 RDI: 0000000000000007
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000538070 R11: 0000000000000293 R12: 00000000005408c8
R13: 000000000053bf00 R14: 00007fff898961e0 R15: 000000000053bf00
Modules linked in:
---[ end trace 0a929a39826015a0 ]---
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 dd 7c 76 fd 48 89 df e8 35 5d af fd 31 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e8 1d ae 6e fd 48 8d bb 38 02 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffff8881d5bffdd0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881ed011b00 RCX: 0000000000000004
RDX: 1ffff1103da0238f RSI: 0000000000000000 RDI: ffff8881ed011c78
RBP: ffff8881d5bffe08 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8881d5bffe18 R11: ffff8881f13984f0 R12: ffff8881f424f2fc
R13: ffff8881f13984f0 R14: ffffffff878494e0 R15: ffff8881f57c0220
FS:  0000000000eb7400(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000050bb34 CR3: 00000001efd3a001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400