kernel BUG in ext4_ext_map

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
462212e4-3858-4251-b98a-06d8506a74aa	assessment-security	DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	kernel BUG in ext4_ext_map_blocks	2026/05/31 04:39	2026/05/31 04:39	2026/05/31 05:34	6b4a844333e83556da95d61d7f207e7ef5cd4bc6
e3bdc382-6308-4e8e-9682-b55636215ad4	assessment-security		💥	kernel BUG in ext4_ext_map_blocks	2026/05/14 14:05	2026/05/14 14:05	2026/05/14 14:06	6ccb967e465e832a7bfd7a116ad00d52a0923a5d	failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: ... truncated to first 200 bytes; open job for full error

Title	Replies (including bot)	Last reply
[syzbot] [ext4?] kernel BUG in ext4_ext_map_blocks	0 (1)	2026/03/01 17:40

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[syzbot] [ext4?] kernel BUG in ext4_ext_map_blocks

0 (1)

2026/03/01 17:40

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-5-10	kernel BUG in ext4_ext_map_blocks	-1				1	109d	109d	0/2	auto-obsoleted due to no activity on 2026/06/05 00:51

Rank 🛈

android-5-10

kernel BUG in ext4_ext_map_blocks

-1

109d

0/2

auto-obsoleted due to no activity on 2026/06/05 00:51

------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:2286! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 14244 Comm: syz.7.1999 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:ext4_ext_find_hole fs/ext4/extents.c:2286 [inline] RIP: 0010:ext4_ext_determine_insert_hole fs/ext4/extents.c:4174 [inline] RIP: 0010:ext4_ext_map_blocks+0x5539/0x58b0 fs/ext4/extents.c:4343 Code: 29 ff 65 48 ff 43 08 e9 e6 ae ff ff e8 10 ef 44 ff 90 0f 0b e8 08 ef 44 ff 90 0f 0b e8 00 ef 44 ff 90 0f 0b e8 f8 ee 44 ff 90 <0f> 0b 65 44 8b 3d 41 19 9b 10 bf 07 00 00 00 44 89 fe e8 20 f3 44 RSP: 0018:ffffc900047beec0 EFLAGS: 00010283 RAX: ffffffff8280a6e8 RBX: 000000000000001a RCX: 0000000000080000 RDX: ffffc90005636000 RSI: 000000000002fc66 RDI: 000000000002fc67 RBP: ffffc900047bf190 R08: ffffc900047bf087 R09: ffffc900047bf060 R10: dffffc0000000000 R11: fffff520008f7e11 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888068c6140c R15: ffff888068c61430 FS: 00007fa3895f76c0(0000) GS:ffff888125464000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000012000 CR3: 0000000052cd6000 CR4: 0000000000350ef0 Call Trace: <TASK> ext4_map_query_blocks+0x13b/0xa00 fs/ext4/inode.c:553 ext4_map_blocks+0x444/0x11d0 fs/ext4/inode.c:771 _ext4_get_block+0x1e3/0x470 fs/ext4/inode.c:909 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:942 ext4_block_write_begin+0xb14/0x1950 fs/ext4/inode.c:1196 ext4_write_begin+0xb40/0x18c0 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x355/0xd80 fs/ext4/inode.c:3123 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4314 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:300 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:688 ksys_pwrite64 fs/read_write.c:795 [inline] __do_sys_pwrite64 fs/read_write.c:803 [inline] __se_sys_pwrite64 fs/read_write.c:800 [inline] __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa38879c799 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:00007fa3895f7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fa388a15fa0 RCX: 00007fa38879c799 RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000007 RBP: 00007fa388832bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa388a16038 R14: 00007fa388a15fa0 R15: 00007ffd0d5ea0a8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_ext_find_hole fs/ext4/extents.c:2286 [inline] RIP: 0010:ext4_ext_determine_insert_hole fs/ext4/extents.c:4174 [inline] RIP: 0010:ext4_ext_map_blocks+0x5539/0x58b0 fs/ext4/extents.c:4343 Code: 29 ff 65 48 ff 43 08 e9 e6 ae ff ff e8 10 ef 44 ff 90 0f 0b e8 08 ef 44 ff 90 0f 0b e8 00 ef 44 ff 90 0f 0b e8 f8 ee 44 ff 90 <0f> 0b 65 44 8b 3d 41 19 9b 10 bf 07 00 00 00 44 89 fe e8 20 f3 44 RSP: 0018:ffffc900047beec0 EFLAGS: 00010283 RAX: ffffffff8280a6e8 RBX: 000000000000001a RCX: 0000000000080000 RDX: ffffc90005636000 RSI: 000000000002fc66 RDI: 000000000002fc67 RBP: ffffc900047bf190 R08: ffffc900047bf087 R09: ffffc900047bf060 R10: dffffc0000000000 R11: fffff520008f7e11 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888068c6140c R15: ffff888068c61430 FS: 00007fa3895f76c0(0000) GS:ffff888125464000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1effe3fe9c CR3: 0000000052cd6000 CR4: 0000000000350ef0

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/03/03 17:37	upstream	af4e9ef3d784	4180d919	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-root	kernel BUG in ext4_ext_map_blocks
2026/02/25 17:35	upstream	7dff99b35460	94a9671e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-fs	kernel BUG in ext4_ext_map_blocks

Crashes (2):

Assets (help?)