kernel BUG in mfill_atomic

ID	Workflow	Correct	Bug	Created	Started	Finished	Revision	Error
c46024fc-68df-4c16-a907-688d7ff47412	assessment-security	💥	kernel BUG in mfill_atomic_copy	2026/06/18 01:14	2026/06/18 01:14	2026/06/18 01:38	b62b3ded1759f79b37600c5ffe2b0a81b919b0b0	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/6d57e08f485ff32ba0... truncated to first 200 bytes; open job for full error
08897d27-bb84-4fc2-a474-94246ff15042	assessment-security	💥	kernel BUG in mfill_atomic_copy	2026/06/09 21:30	2026/06/09 21:30	2026/06/09 21:53	c36c07f6c1f2230a36374cbd22235f635e8f9284	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/6d57e08f485ff32ba0... truncated to first 200 bytes; open job for full error
f79ba104-90fc-4214-a87a-6c1eabc1b65c	assessment-security	💥	kernel BUG in mfill_atomic_copy	2026/06/02 22:48	2026/06/02 22:48	2026/06/02 23:07	62fe15281f5011cd203d8845b8767b10e7443aa5	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/6d57e08f485ff32ba0... truncated to first 200 bytes; open job for full error
23cf4c9c-9de1-414a-a160-ad13c1bcc205	assessment-security	💥	kernel BUG in mfill_atomic_copy	2026/05/31 03:38	2026/05/31 03:38	2026/05/31 04:02	6b4a844333e83556da95d61d7f207e7ef5cd4bc6	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/6d57e08f485ff32ba0... truncated to first 200 bytes; open job for full error
f93216f0-7970-4028-9feb-5dfdef37f508	assessment-security	💥	kernel BUG in mfill_atomic_copy	2026/05/14 13:51	2026/05/14 13:51	2026/05/14 13:53	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
[PATCH mm-unstable fix] mm: userfaultfd: check for start + len overflow in validate_range: fix	4 (4)	2023/08/10 19:23
[syzbot] [mm?] kernel BUG in mfill_atomic_copy	2 (3)	2023/07/14 18:18

Title

Replies (including bot)

Last reply

[PATCH mm-unstable fix] mm: userfaultfd: check for start + len overflow in validate_range: fix

4 (4)

2023/08/10 19:23

[syzbot] [mm?] kernel BUG in mfill_atomic_copy

2 (3)

2023/07/14 18:18

------------[ cut here ]------------ kernel BUG at mm/userfaultfd.c:573! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5031 Comm: syz-executor410 Not tainted 6.5.0-rc1-next-20230710-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:mfill_atomic mm/userfaultfd.c:573 [inline] RIP: 0010:mfill_atomic_copy+0x9ed/0x17e0 mm/userfaultfd.c:725 Code: 8d 8c 24 a8 00 00 00 4c 89 e7 e8 be 54 d9 ff 4c 63 f0 e9 71 fc ff ff e8 51 eb a1 ff 0f 0b e8 4a eb a1 ff 0f 0b e8 43 eb a1 ff <0f> 0b e8 3c eb a1 ff 0f 0b 49 c7 c6 ef ff ff ff e9 54 fd ff ff e8 RSP: 0018:ffffc9000395fb48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88801f67bb80 RSI: ffffffff81e32bad RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000006 R09: ffffffffffffffff R10: 0000000005ffffff R11: 0000000000000001 R12: 0000200000000000 R13: 00005ffffffff001 R14: ffffffffffffffff R15: 0000000005ffffff FS: 00005555571e03c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000060 CR3: 000000002ba7a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> userfaultfd_copy fs/userfaultfd.c:1766 [inline] userfaultfd_ioctl+0xe43/0x4c40 fs/userfaultfd.c:2098 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2e41c4b4b9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff13a95188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff13a95198 RCX: 00007f2e41c4b4b9 RDX: 0000000020000040 RSI: 00000000c028aa03 RDI: 0000000000000003 RBP: 00007fff13a95190 R08: 00007fff13a95190 R09: 00007f2e41c0e380 R10: 00007fff13a95190 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mfill_atomic mm/userfaultfd.c:573 [inline] RIP: 0010:mfill_atomic_copy+0x9ed/0x17e0 mm/userfaultfd.c:725 Code: 8d 8c 24 a8 00 00 00 4c 89 e7 e8 be 54 d9 ff 4c 63 f0 e9 71 fc ff ff e8 51 eb a1 ff 0f 0b e8 4a eb a1 ff 0f 0b e8 43 eb a1 ff <0f> 0b e8 3c eb a1 ff 0f 0b 49 c7 c6 ef ff ff ff e9 54 fd ff ff e8 RSP: 0018:ffffc9000395fb48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff88801f67bb80 RSI: ffffffff81e32bad RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000006 R09: ffffffffffffffff R10: 0000000005ffffff R11: 0000000000000001 R12: 0000200000000000 R13: 00005ffffffff001 R14: ffffffffffffffff R15: 0000000005ffffff FS: 00005555571e03c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000060 CR3: 000000002ba7a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2023/07/10 09:22	linux-next	fe57d0d86f03	668cb1fa	.config	strace log	report	syz	C		[disk image] [vmlinux] [kernel image]	ci-upstream-linux-next-kasan-gce-root	kernel BUG in mfill_atomic_copy
2023/07/10 06:37	linux-next	fe57d0d86f03	668cb1fa	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-linux-next-kasan-gce-root	kernel BUG in mfill_atomic_copy
2023/07/10 03:29	linux-next	fe57d0d86f03	668cb1fa	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-linux-next-kasan-gce-root	kernel BUG in mfill_atomic_copy

Crashes (3):

Assets (help?)