general protection fault in mtd_test

Date	Name	Commit	Repro	Result
2026/09/30	linux-5.15.y (ToT)	0248c33e835e	C	[report] general protection fault in mtd_test_super
2026/09/30	upstream (ToT)	551c722f4080	C	Didn't crash

Date

Name

Commit

Repro

Result

2026/09/30

linux-5.15.y (ToT)

0248c33e835e

[report] general protection fault in mtd_test_super

2026/09/30

upstream (ToT)

551c722f4080

Didn't crash


Created	Duration	User	Repo	Result
2026/10/18 11:36	15m	retest repro	linux-5.15.y	report job log log
2026/10/18 11:36	16m	retest repro	linux-5.15.y	report job log log
2026/10/18 11:36	13m	retest repro	linux-5.15.y	report job log log

general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 0 PID: 4389 Comm: syz.3.24 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:mtd_test_super+0xa4/0x1d0 drivers/mtd/mtdsuper.c:36 Code: 41 5c 41 5e 41 5f 5d c3 e8 49 8c 4d fc 43 80 3c 27 00 74 08 4c 89 f7 e8 fa bf 92 fc 4d 8b 36 49 8d 7e 40 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cd 00 00 00 41 8b 6e 40 49 83 c6 38 4c RSP: 0018:ffffc900042afbd0 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff8880221a8000 RCX: ffff888029431dc0 RDX: 0000000000000000 RSI: ffff88805975ac00 RDI: 0000000000000040 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000855f70 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff1100f034c2e FS: 0000555575ba3500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc33f3166c8 CR3: 000000005aef7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> sget_fc+0x1f0/0x6f0 fs/super.c:548 mtd_get_sb+0x5a/0x2b0 drivers/mtd/mtdsuper.c:65 mtd_get_sb_by_nr drivers/mtd/mtdsuper.c:110 [inline] get_tree_mtd+0x4e2/0x760 drivers/mtd/mtdsuper.c:180 romfs_get_tree+0x19/0x50 fs/romfs/super.c:560 vfs_get_tree+0x88/0x270 fs/super.c:1541 do_new_mount+0x247/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5a58aba159 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:00007ffd821dad28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5a58d41fa0 RCX: 00007f5a58aba159 RDX: 00002000000002c0 RSI: 0000200000000200 RDI: 00002000000000c0 RBP: 00007f5a58b5106b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000023000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5a58d41fac R14: 00007f5a58d41fa0 R15: 00007f5a58d41fa0 </TASK> Modules linked in: ---[ end trace 3e2e0307e504924b ]--- RIP: 0010:mtd_test_super+0xa4/0x1d0 drivers/mtd/mtdsuper.c:36 Code: 41 5c 41 5e 41 5f 5d c3 e8 49 8c 4d fc 43 80 3c 27 00 74 08 4c 89 f7 e8 fa bf 92 fc 4d 8b 36 49 8d 7e 40 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cd 00 00 00 41 8b 6e 40 49 83 c6 38 4c RSP: 0018:ffffc900042afbd0 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff8880221a8000 RCX: ffff888029431dc0 RDX: 0000000000000000 RSI: ffff88805975ac00 RDI: 0000000000000040 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000855f70 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff1100f034c2e FS: 0000555575ba3500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc33f3166c8 CR3: 000000005aef7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 5c pop %r12 2: 41 5e pop %r14 4: 41 5f pop %r15 6: 5d pop %rbp 7: c3 ret 8: e8 49 8c 4d fc call 0xfc4d8c56 d: 43 80 3c 27 00 cmpb $0x0,(%r15,%r12,1) 12: 74 08 je 0x1c 14: 4c 89 f7 mov %r14,%rdi 17: e8 fa bf 92 fc call 0xfc92c016 1c: 4d 8b 36 mov (%r14),%r14 1f: 49 8d 7e 40 lea 0x40(%r14),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 cd 00 00 00 jne 0x104 37: 41 8b 6e 40 mov 0x40(%r14),%ebp 3b: 49 83 c6 38 add $0x38,%r14 3f: 4c rex.WR

Crashes (5):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/09/28 19:41	linux-5.15.y	0248c33e835e	a3c7249d	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	general protection fault in mtd_test_super
2026/09/28 16:11	linux-5.15.y	0248c33e835e	a3c7249d	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	general protection fault in mtd_test_super
2026/09/28 13:12	linux-5.15.y	0248c33e835e	a3c7249d	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	general protection fault in mtd_test_super
2026/09/28 10:01	linux-5.15.y	0248c33e835e	a3c7249d	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	general protection fault in mtd_test_super
2026/09/28 06:34	linux-5.15.y	0248c33e835e	a3c7249d	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	general protection fault in mtd_test_super

Crashes (5):

Assets (help?)