syzbot


kernel BUG in jfs_flush_journal (3)

Status: upstream: reported on 2026/03/01 21:09
Subsystems: jfs
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+4c8d1f29732a21567e4e@syzkaller.appspotmail.com
First crash: 102d, last: 12d
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision Error
0f538560-8acb-4f1e-a34b-a298c8e1fd26 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ✅ kernel BUG in jfs_flush_journal (3) 2026/05/31 12:35 2026/05/31 12:35 2026/05/31 13:17 6b4a844333e83556da95d61d7f207e7ef5cd4bc6
6550b220-2343-4620-ba4c-c5f4d7a736f3 assessment-security 💥 kernel BUG in jfs_flush_journal (3) 2026/05/14 16:40 2026/05/14 16:40 2026/05/14 16:42 6ccb967e465e832a7bfd7a116ad00d52a0923a5d failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/151170a375c273e4d2ab7f991734f6b933575017" "-s" "bzImage" "compile_commands.json"]: exit status 2 /app/workdir/cache/src/e38afd075ec101b77b219b3a7e38f81a60b6acf7/lib/maple_tree.c:3514:20: warning: stack frame size (2424) exceeds limit (2048) in 'mas_wr_store_entry' [-Wframe-larger-than] 3514 | static inline void mas_wr_store_entry(struct ma_wr_state *wr_mas) | ^ 1 warning generated. /app/workdir/cache/src/e38afd075ec101b77b219b3a7e38f81a60b6acf7/sound/usb/mixer_s1810c.c:634:5: warning: stack frame size (2360) exceeds limit (2048) in 'snd_sc1810_init_mixer' [-Wframe-larger-than] 634 | int snd_sc1810_init_mixer(struct usb_mixer_interface *mixer) | ^ 1 warning generated. /app/workdir/cache/src/e38afd075ec101b77b219b3a7e38f81a60b6acf7/net/ethtool/cmis_fw_update.c:432:1: warning: stack frame size (2392) exceeds limit (2048) in 'ethtool_cmis_fw_update' [-Wframe-larger-than] 432 | ethtool_cmis_fw_update(struct ethtool_cmis_fw_update_params *fw_update) | ^ 1 warning generated. fixdep: not all data was written to the output make[6]: *** [/app/workdir/cache/src/e38afd075ec101b77b219b3a7e38f81a60b6acf7/scripts/Makefile.build:289: drivers/dma/ioat/init.o] Error 1 make[6]: *** Deleting file 'drivers/dma/ioat/init.o' make[6]: *** Waiting for unfinished jobs.... fatal error: error in backend: IO failure on output stream: No space left on device PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump: 0. Program arguments: /usr/bin/clang --target=x86_64-linux-gnu -fintegrated-as -Werror=unknown-warning-option -Werror=ignored-optimization-argument -Werror=option-ignored -Werror=unused-command-line-argument -fmacro-prefix-map=/app/workdir/cache/src/e38afd075ec101b77b219b3a7e38f81a60b6acf7/= -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -std=gnu11 -fms-extensions -Wno-gnu -Wno-microsoft-anon-tag -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -mno-sse4a -fcf-protection=branch -fno-jump-tables -m64 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mstack-alignment=8 -mskip-rax-setup -march=x86-64 -mtune=generic -mno-red-zone -mcmodel=kernel -mstack-protector-guard-reg=gs -mstack-protector-guard-symbol=__ref_stack_chk_guard -Wno-sign-compare -fno-asynchronous-unwind-tables -mretpoline-external-thunk -mindirect-branch-cs-prefix -mfunction-return=thunk-extern -fpatchable-function-entry=16,16 -fno-delete-null-pointer-checks -O2 -fstack-protector-strong -fomit-frame-pointer -ftrivial-auto-var-init=zero -fno-stack-clash-protection -falign-functions=16 -fstrict-flex-arrays=3 -fno-strict-overflow -fno-stack-check -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Werror=strict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-address -Wno-address-of-packed-member -Wmissing-declarations -Wmissing-prototypes -Wframe-larger-than=2048 -Wno-format-overflow-non-kprintf -Wno-format-truncation-non-kprintf -Wno-default-const-init-unsafe -Wno-type-limits -Wno-pointer-sign -Wcast-function-type -Wno-unterminated-string-initialization -Wimplicit-fallthrough -Werror=date-time -Werror=incompatible-pointer-types -Wenum-conversion -Wunused -Wno-unused-but-set-variable -Wno-unused-const-variable -Wno-format-overflow -Wno-override-init -Wno-pointer-to-enum-cast -Wno-tautological-constant-out-of-range-compare -Wno-unaligned-access -Wno-enum-compare-conditional -Wno-missing-field-initializers -Wno-shift-negative-value -Wno-enum-enum-conversion -Wno-sign-compare -Wno-unused-parameter -g -gdwarf-4 -fsanitize=kernel-address -mllvm -asan-mapping-offset=0xdffffc0000000000 -mllvm -asan-instrumentation-with-call-threshold=10000 -mllvm -asan-stack=1 -mllvm -asan-globals=1 -mllvm -asan-kernel-mem-intrinsic-prefix=1 -fsanitize=array-bounds -fsanit
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] kernel BUG in jfs_flush_journal (3) 0 (1) 2026/03/01 21:09
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in jfs_flush_journal -1 1 782d 782d 0/3 auto-obsoleted due to no activity on 2024/07/26 08:47
upstream kernel BUG in jfs_flush_journal (2) jfs -1 15 230d 733d 0/29 auto-obsoleted due to no activity on 2026/01/29 01:09
upstream kernel BUG in jfs_flush_journal jfs -1 2 1178d 1175d 0/29 auto-obsoleted due to no activity on 2023/07/16 07:52

Sample crash report:
BUG at fs/jfs/jfs_logmgr.c:1585 assert(list_empty(&log->cqueue))
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_logmgr.c:1585!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6081 Comm: syz.2.56 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:jfs_flush_journal+0xf31/0xf50 fs/jfs/jfs_logmgr.c:1585
Code: e9 98 f5 ff ff e8 5f d2 6b fe 48 c7 c7 00 79 6b 8b 48 c7 c6 00 74 6b 8b ba 31 06 00 00 48 c7 c1 40 79 6b 8b e8 40 b8 ce fd 90 <0f> 0b e8 38 d2 6b fe bf 02 00 00 00 e8 8e de 3a fe e9 ab f7 ff ff
RSP: 0018:ffffc900063afb20 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: d97dc4a5bd845700
RDX: ffffc900049c9000 RSI: 000000000000698f RDI: 0000000000006990
RBP: ffffc900063afc58 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000c75f15 R12: 00000000000000c7
R13: ffff88806087d218 R14: ffff88806087d000 R15: ffff88806087d2d8
FS:  00007f597eec66c0(0000) GS:ffff888126390000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8cc25cff8 CR3: 00000000324fa000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_umount_rw+0x75/0x130 fs/jfs/jfs_umount.c:144
 jfs_reconfigure+0x6f6/0xa00 fs/jfs/super.c:421
 reconfigure_super+0x227/0x8a0 fs/super.c:1080
 do_remount fs/namespace.c:3400 [inline]
 path_mount+0xdc5/0x10e0 fs/namespace.c:4146
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4360
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5980c6ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f597eec6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5980ee5fa0 RCX: 00007f5980c6ce59
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f5980d02d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5980ee6038 R14: 00007f5980ee5fa0 R15: 00007ffd0c9672b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:jfs_flush_journal+0xf31/0xf50 fs/jfs/jfs_logmgr.c:1585
Code: e9 98 f5 ff ff e8 5f d2 6b fe 48 c7 c7 00 79 6b 8b 48 c7 c6 00 74 6b 8b ba 31 06 00 00 48 c7 c1 40 79 6b 8b e8 40 b8 ce fd 90 <0f> 0b e8 38 d2 6b fe bf 02 00 00 00 e8 8e de 3a fe e9 ab f7 ff ff
RSP: 0018:ffffc900063afb20 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: d97dc4a5bd845700
RDX: ffffc900049c9000 RSI: 000000000000698f RDI: 0000000000006990
RBP: ffffc900063afc58 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000c75f15 R12: 00000000000000c7
R13: ffff88806087d218 R14: ffff88806087d000 R15: ffff88806087d2d8
FS:  00007f597eec66c0(0000) GS:ffff888126390000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8cc25cff8 CR3: 00000000324fa000 CR4: 00000000003526f0

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/27 13:21 upstream eb3f4b7426cf 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/05/01 15:50 upstream 26fd6bff2c05 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/03/02 18:57 upstream 11439c4635ed b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
2026/02/25 21:01 upstream d9d32e5bd5a4 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in jfs_flush_journal
* Struck through repros no longer work on HEAD.