syzbot


kernel BUG in jfs_flush_journal (3)

Status: upstream: reported on 2026/03/01 21:09
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+4c8d1f29732a21567e4e@syzkaller.appspotmail.com
First crash: 79d, last: 14d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
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 759d 759d 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 207d 710d 0/29 auto-obsoleted due to no activity on 2026/01/29 01:09
upstream kernel BUG in jfs_flush_journal jfs -1 2 1155d 1151d 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: 5599 Comm: syz-executor 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 af 84 6c fe 48 c7 c7 00 64 8b 8b 48 c7 c6 00 5f 8b 8b ba 31 06 00 00 48 c7 c1 40 64 8b 8b e8 80 67 cf fd 90 <0f> 0b e8 88 84 6c fe bf 02 00 00 00 e8 ee 98 3b fe e9 ab f7 ff ff
RSP: 0018:ffffc90004827b00 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: 67f305e03d844200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004827c38 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000904f11 R12: 00000000000000c7
R13: ffff8880653eaa18 R14: ffff8880653ea800 R15: ffff8880653eaad8
FS:  00005555671c7500(0000) GS:ffff88812617a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f013fef0000 CR3: 0000000058130000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_umount+0x171/0x3d0 fs/jfs/jfs_umount.c:59
 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
 kill_block_super+0x44/0x90 fs/super.c:1725
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8442f6e017
Code: a2 c7 05 dc 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe57292f38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f8443002120 RCX: 00007f8442f6e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe57292ff0
RBP: 00007ffe57292ff0 R08: 00007ffe57293ff0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe57294080
R13: 00007f8443002120 R14: 000000000004193e R15: 00007ffe572940c0
 </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 af 84 6c fe 48 c7 c7 00 64 8b 8b 48 c7 c6 00 5f 8b 8b ba 31 06 00 00 48 c7 c1 40 64 8b 8b e8 80 67 cf fd 90 <0f> 0b e8 88 84 6c fe bf 02 00 00 00 e8 ee 98 3b fe e9 ab f7 ff ff
RSP: 0018:ffffc90004827b00 EFLAGS: 00010246
RAX: 0000000000000040 RBX: dffffc0000000000 RCX: 67f305e03d844200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004827c38 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000904f11 R12: 00000000000000c7
R13: ffff8880653eaa18 R14: ffff8880653ea800 R15: ffff8880653eaad8
FS:  00005555671c7500(0000) GS:ffff88812617a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f013fef0000 CR3: 0000000058130000 CR4: 00000000003526f0

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.