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BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put

Status: upstream: reported C repro on 2019/11/29 19:55
Reported-by: syzbot+5818edfe0769a2d0f9d1@syzkaller.appspotmail.com
First crash: 1854d, last: 676d
▶ ▼ Fix bisection attempts (7)
Created Duration User Patch Repo Result
2023/02/19 23:09 22m bisect fix linux-4.14.y OK (0) job log log
2021/11/19 19:40 24m bisect fix linux-4.14.y OK (0) job log log
2021/10/20 19:15 24m bisect fix linux-4.14.y OK (0) job log log
2021/09/20 18:52 22m bisect fix linux-4.14.y OK (0) job log log
2021/07/28 06:56 26m bisect fix linux-4.14.y OK (0) job log log
2021/06/12 13:04 29m bisect fix linux-4.14.y OK (0) job log log
2020/12/29 19:20 22m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: refcount_dec_and_test arch/x86/include/asm/refcount.h:75 [inline]
IP: vb2_vmalloc_put+0x9/0x60 drivers/media/v4l2-core/videobuf2-vmalloc.c:68
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7970 Comm: syz-executor118 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
task: ffff8880b3a6a300 task.stack: ffff88808d528000
RIP: 0010:refcount_dec_and_test arch/x86/include/asm/refcount.h:75 [inline]
RIP: 0010:vb2_vmalloc_put+0x9/0x60 drivers/media/v4l2-core/videobuf2-vmalloc.c:68
RSP: 0018:ffff88808d52fb98 EFLAGS: 00010297
RAX: ffff8880b3a6a300 RBX: ffff8880a4b94d40 RCX: 1ffff1101674d57a
RDX: 0000000000000000 RSI: ffff8880b3a6abb0 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a4b94d54 R14: 0000000000000000 R15: ffffffff84c281a0
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000020 CR3: 0000000008e6a000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __vb2_buf_mem_free+0xfa/0x1d0 drivers/media/v4l2-core/videobuf2-core.c:240
 __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:409 [inline]
 __vb2_queue_free+0x60d/0x7a0 drivers/media/v4l2-core/videobuf2-core.c:454
 vb2_core_queue_release+0x5b/0x70 drivers/media/v4l2-core/videobuf2-core.c:2054
 v4l2_m2m_ctx_release+0x26/0x30 drivers/media/v4l2-core/v4l2-mem2mem.c:702
 vim2m_release+0xd4/0x120 drivers/media/platform/vim2m.c:959
 v4l2_release+0xf4/0x190 drivers/media/v4l2-core/v4l2-dev.c:446
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xa44/0x2850 kernel/exit.c:868
 do_group_exit+0x100/0x2e0 kernel/exit.c:965
 SYSC_exit_group kernel/exit.c:976 [inline]
 SyS_exit_group+0x19/0x20 kernel/exit.c:974
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f8adb043f19
RSP: 002b:00007ffd4b3dac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f8adb0b8270 RCX: 00007f8adb043f19
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8adb0b8270
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
Code: e9 ca fc ff ff e8 b8 99 bc fc e9 96 fc ff ff e8 de 9b bc fc e9 fd fe ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 fd e8 97 d8 92 fc <f0> ff 4d 20 0f 88 f0 d9 5f 02 74 06 5d e9 85 d8 92 fc e8 80 d8 
RIP: refcount_dec_and_test arch/x86/include/asm/refcount.h:75 [inline] RSP: ffff88808d52fb98
RIP: vb2_vmalloc_put+0x9/0x60 drivers/media/v4l2-core/videobuf2-vmalloc.c:68 RSP: ffff88808d52fb98
CR2: 0000000000000020
---[ end trace 8534a613c3f7056b ]---
----------------
Code disassembly (best guess):
   0:	e9 ca fc ff ff       	jmpq   0xfffffccf
   5:	e8 b8 99 bc fc       	callq  0xfcbc99c2
   a:	e9 96 fc ff ff       	jmpq   0xfffffca5
   f:	e8 de 9b bc fc       	callq  0xfcbc9bf2
  14:	e9 fd fe ff ff       	jmpq   0xffffff16
  19:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  20:	00 00
  22:	55                   	push   %rbp
  23:	48 89 fd             	mov    %rdi,%rbp
  26:	e8 97 d8 92 fc       	callq  0xfc92d8c2
* 2b:	f0 ff 4d 20          	lock decl 0x20(%rbp) <-- trapping instruction
  2f:	0f 88 f0 d9 5f 02    	js     0x25fda25
  35:	74 06                	je     0x3d
  37:	5d                   	pop    %rbp
  38:	e9 85 d8 92 fc       	jmpq   0xfc92d8c2
  3d:	e8                   	.byte 0xe8
  3e:	80                   	.byte 0x80
  3f:	d8                   	.byte 0xd8

Crashes (153):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/31 12:45 linux-4.14.y c4215ee4771b ab32d508 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/12/23 04:31 linux-4.14.y c4215ee4771b 9da18ae8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/09/09 20:59 linux-4.14.y 65640c873dcf 90058bdc .config console log report syz C ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/05/20 00:38 linux-4.14.y dffb5c6ff09c cb1ac2e7 .config console log report syz C ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2019/11/29 19:13 linux-4.14.y 43598c571e7e 4f7e1d0f .config console log report syz C ci2-linux-4-14
2023/01/20 20:01 linux-4.14.y 97205fccccdc dd15ff29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2023/01/17 06:48 linux-4.14.y c4215ee4771b a63719e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/12/24 08:49 linux-4.14.y c4215ee4771b 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/12/23 04:16 linux-4.14.y c4215ee4771b 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/12/18 12:58 linux-4.14.y c4215ee4771b 05494336 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/11/19 03:25 linux-4.14.y e911713e40ca 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/11/18 12:53 linux-4.14.y e911713e40ca 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/11/17 08:39 linux-4.14.y e911713e40ca 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/11/06 06:01 linux-4.14.y a901bb6c7db7 6d752409 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/11/04 07:45 linux-4.14.y a901bb6c7db7 6d752409 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/10/12 19:12 linux-4.14.y 9d5c0b3a8e1a 16a9c9e0 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/10/09 16:57 linux-4.14.y 9d5c0b3a8e1a aea5da89 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/10/07 01:17 linux-4.14.y 9d5c0b3a8e1a 80b58a42 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/09/23 22:21 linux-4.14.y 4edbf74132a4 0042f2b4 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/09/14 21:58 linux-4.14.y 65640c873dcf b884348d .config console log report info [disk image] [vmlinux] ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/09/09 20:48 linux-4.14.y 65640c873dcf 90058bdc .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/08/27 18:37 linux-4.14.y e548869f356f 07177916 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/08/05 03:27 linux-4.14.y b641242202ed 1c9013ac .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/08/03 11:09 linux-4.14.y b641242202ed 1c9013ac .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/07/30 16:55 linux-4.14.y b641242202ed fef302b1 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/07/28 10:18 linux-4.14.y 9c3bf9cf362f fb95c74d .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/07/15 08:16 linux-4.14.y 424a46ea058e 5d921b08 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/07/03 02:56 linux-4.14.y ed2e96e11936 1434eec0 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/06/18 14:52 linux-4.14.y 84bae26850e3 8f633d84 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/06/13 06:54 linux-4.14.y b8f3be299d51 0d5abf15 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/06/12 15:17 linux-4.14.y b8f3be299d51 0d5abf15 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/05/24 14:46 linux-4.14.y dffb5c6ff09c fcfad4ff .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/05/20 21:07 linux-4.14.y dffb5c6ff09c bd37ad7e .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/05/20 00:24 linux-4.14.y dffb5c6ff09c cb1ac2e7 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/04/20 02:27 linux-4.14.y 74766a973637 33fc6ed6 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/04/16 20:49 linux-4.14.y 74766a973637 8bcc32a6 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/03/27 22:39 linux-4.14.y 004bfaafc45c 89bc8608 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/03/21 07:21 linux-4.14.y eb045674aab3 e2d91b1d .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/03/17 14:57 linux-4.14.y eb045674aab3 dfa9a8ed .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/03/15 15:31 linux-4.14.y af48f51cb593 9e8eaa75 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/03/13 10:33 linux-4.14.y af48f51cb593 9e8eaa75 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/03/03 18:56 linux-4.14.y e853993d29aa 45a13a73 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/02/23 07:52 linux-4.14.y a35d65bedfbc 6e821dbf .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/02/18 04:03 linux-4.14.y a35d65bedfbc 3cd800e4 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/02/17 06:37 linux-4.14.y a35d65bedfbc 50221962 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/02/14 21:28 linux-4.14.y 8034e99d1a01 8b9ca619 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/01/19 18:40 linux-4.14.y 4ba8e26127c3 0620189b .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2022/01/18 18:58 linux-4.14.y 4ba8e26127c3 731a2d23 .config console log report info ci2-linux-4-14 BUG: unable to handle kernel NULL pointer dereference in vb2_vmalloc_put
2021/01/10 08:58 linux-4.14.y ec822b3e8bf4 2c1f2513 .config console log report info ci2-linux-4-14
* Struck through repros no longer work on HEAD.