syzbot

 sign-in | mailing list | source | docs
🐞 Open [969] ≡ Subsystems 🐞 Fixed [4558] 🐞 Invalid [10510] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

WARNING in __kernel_write_iter

Status: upstream: reported C repro on 2022/10/10 07:04
Labels: btrfs (incorrect?)
Reported-by: syzbot+12e098239d20385264d3@syzkaller.appspotmail.com
First crash: 235d, last: 8h10m

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in __kernel_write (log)
Repro: C syz .config
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[syzbot] Monthly btrfs report (May 2023) 0 (1) 2023/05/30 08:21
[syzbot] Monthly btrfs report (Apr 2023) 0 (1) 2023/04/27 10:13
[syzbot] [btrfs] Monthly Report 1 (2) 2023/03/27 13:42
[syzbot] WARNING in __kernel_write_iter 0 (2) 2022/11/27 02:44
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in __kernel_write_iter origin:upstream C 125 6d04h 73d 0/3 upstream: reported C repro on 2023/03/20 18:36

Sample crash report:
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): auto enabling async discard
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4991 at fs/read_write.c:504 __kernel_write_iter+0x604/0x710
Modules linked in:
CPU: 0 PID: 4991 Comm: syz-executor145 Not tainted 6.3.0-syzkaller-13466-gfc4354c6e5c2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:__kernel_write_iter+0x604/0x710 fs/read_write.c:504
Code: 25 28 00 00 00 48 3b 84 24 e0 00 00 00 0f 85 18 01 00 00 4c 89 f0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ac f3 98 ff <0f> 0b 49 c7 c6 f7 ff ff ff eb a5 e8 9c f3 98 ff 4c 8b 74 24 18 eb
RSP: 0018:ffffc90003c0f700 EFLAGS: 00010293
RAX: ffffffff81f27394 RBX: 00000000000a801d RCX: ffff88801eedd940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003c0f830 R08: ffffffff81f26e69 R09: 0000000000000000
R10: ffffc90003c0f8a0 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92000781eec R14: ffff88802a61ec80 R15: 1ffff110054c3d9f
FS:  0000555556675300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc67e9932a9 CR3: 000000007b7e0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __kernel_write fs/read_write.c:537 [inline]
 kernel_write+0x1d8/0x350 fs/read_write.c:558
 write_buf fs/btrfs/send.c:648 [inline]
 send_header fs/btrfs/send.c:766 [inline]
 send_subvol+0x1ab/0x4960 fs/btrfs/send.c:7926
 btrfs_ioctl_send+0x2113/0x2750 fs/btrfs/send.c:8302
 _btrfs_ioctl_send+0x2ff/0x430 fs/btrfs/ioctl.c:4351
 btrfs_ioctl+0x907/0xd40
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f70fda82809
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdc5263c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f70fda82809
RDX: 0000000020000140 RSI: 0000000040489426 RDI: 0000000000000004
RBP: 00007f70fda420d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f70fda42160
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Crashes (445):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/05/07 16:22 upstream fc4354c6e5c2 90c93c40 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/05 10:22 upstream 78b421b6a7c6 518a39a6 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/12/13 13:50 upstream 3a28c2c89f4b 67be1ae7 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2022/12/13 11:09 upstream 3a28c2c89f4b 67be1ae7 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2022/12/13 10:31 upstream 3a28c2c89f4b 67be1ae7 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2022/12/13 10:16 upstream 3a28c2c89f4b 67be1ae7 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2022/11/28 09:39 upstream cf562a45a0d5 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/28 08:58 upstream cf562a45a0d5 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/28 08:37 upstream cf562a45a0d5 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/28 05:31 upstream cf562a45a0d5 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/28 05:10 upstream cf562a45a0d5 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/28 04:50 upstream cf562a45a0d5 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/28 02:11 upstream faf68e3523c2 f4470a7b .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in __kernel_write_iter
2022/11/27 02:59 upstream 644e9524388a 74a66371 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-selinux-root WARNING in __kernel_write_iter
2022/11/27 02:47 upstream 644e9524388a 74a66371 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root WARNING in __kernel_write_iter
2022/11/27 02:47 upstream 644e9524388a 74a66371 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2022/11/27 02:57 linux-next 9e46a7996732 74a66371 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root WARNING in __kernel_write_iter
2023/05/07 18:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 14f8db1c0f9a 90c93c40 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2023/05/05 12:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 14f8db1c0f9a 518a39a6 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 15:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 15:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 15:15 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 13:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 13:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 12:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2022/11/27 02:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 74a66371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2023/06/02 07:59 upstream 1874a42a7d74 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2023/06/01 21:36 upstream 929ed21dfdb6 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in __kernel_write_iter
2023/06/01 20:44 upstream 929ed21dfdb6 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __kernel_write_iter
2023/06/01 11:14 upstream 48b1320a674e babc4389 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/06/01 09:15 upstream 48b1320a674e babc4389 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/06/01 05:36 upstream 48b1320a674e babc4389 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/31 17:39 upstream afead42fdfca 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/31 11:41 upstream afead42fdfca 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/31 03:18 upstream afead42fdfca df37c7f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/30 14:54 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/30 08:04 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/30 05:12 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/30 03:57 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __kernel_write_iter
2023/05/30 01:04 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2023/05/29 21:43 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/29 15:49 upstream 8b817fded42d cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/28 22:54 upstream 416839029e38 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/28 06:55 upstream 4e893b5aa4ac cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/27 17:42 upstream 49572d536129 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/27 11:36 upstream 49572d536129 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/26 01:35 upstream 9db898594c54 0513b3e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/25 19:28 upstream 933174ae28ba 0513b3e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/25 13:09 upstream 933174ae28ba 0513b3e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/25 00:57 upstream 9d646009f65d 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/24 22:33 upstream 9d646009f65d 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/24 19:07 upstream 9d646009f65d 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/24 11:58 upstream 27e462c8fad4 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/23 18:21 upstream ae8373a5add4 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/23 17:47 upstream ae8373a5add4 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/22 21:56 upstream 44c026a73be8 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/22 08:11 upstream e2065b8c1b01 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __kernel_write_iter
2023/05/22 03:11 upstream e2065b8c1b01 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/21 07:38 upstream 0dd2a6fb1e34 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/17 00:32 upstream f1fcbaa18b28 11c89444 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/15 12:25 upstream f1fcbaa18b28 c4d362e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/14 18:12 upstream bb7c241fae62 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __kernel_write_iter
2023/05/14 17:54 upstream bb7c241fae62 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/13 06:56 upstream 9a48d6046722 ecca8a24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/10 08:55 upstream 1dc3731daf1f 1964022b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in __kernel_write_iter
2023/05/09 08:55 upstream ba0ad6ed89fd c7a5e2a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/08 02:31 upstream 17784de648be 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/07 13:32 upstream fc4354c6e5c2 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in __kernel_write_iter
2023/05/07 13:15 upstream fc4354c6e5c2 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2023/05/06 15:02 upstream 2e1e1337881b 90c93c40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __kernel_write_iter
2022/10/09 19:20 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] ci2-upstream-fs WARNING in __kernel_write_iter
2023/06/01 19:20 upstream 929ed21dfdb6 a4ae4f42 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __kernel_write_iter
2023/05/14 21:51 upstream 31f4104e392a 2b9ba477 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __kernel_write_iter
2023/06/01 22:37 linux-next 715abedee4cd a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __kernel_write_iter
2023/05/19 04:28 linux-next 715abedee4cd 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __kernel_write_iter
2023/05/12 11:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 14f8db1c0f9a adb9a3cd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
2023/05/10 19:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 14f8db1c0f9a 0fbd49f4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __kernel_write_iter
* Struck through repros no longer work on HEAD.