general protection fault in bpf_inode_storage_free

Status: upstream: reported C repro on 2026/10/14 08:37
Subsystems: bpf
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+b547ffac63b636628299@syzkaller.appspotmail.com
First crash: 4d13h, last: 3d18h
Cause bisection: failed (error log, bisect log)
  
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ID Workflow Result Correct Bug Created Started Finished Revision
e46b3fe6 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ general protection fault in bpf_inode_storage_free 2026/10/12 00:59 2026/10/12 00:59 2026/10/12 01:40 4f92358f
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Title Replies (including bot) Last reply
[syzbot] [bpf?] general protection fault in bpf_inode_storage_free 0 (1) 2026/10/14 08:37
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in bpf_inode_storage_free bpf 17 5 548d 725d 0/29 auto-obsoleted due to no activity on 2025/07/23 19:59

Sample crash report:
ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 3
ERROR: (device loop0): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 5
Oops: general protection fault, probably for non-canonical address 0xdffffc018ef8da81: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000c77c6d408-0x0000000c77c6d40f]
CPU: 1 UID: 0 PID: 5630 Comm: syz-executor383 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:bpf_inode_storage_free+0x1f4/0x5c0 kernel/bpf/bpf_inode_storage.c:67
Code: d2 c1 d2 ff c6 05 75 65 6d 0f 01 48 c7 c7 60 3f 17 8c be 53 03 00 00 48 c7 c2 a0 3f 17 8c e8 c3 21 ae ff 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 8d b0 45 00 4d 8b 36 e8 d5 24 f9
RSP: 0018:ffffc90003a6f8f0 EFLAGS: 00010206
RAX: 000000018ef8da81 RBX: ffff888075cd04c0 RCX: ffff888075cd0000
RDX: 0000000000000000 RSI: ffffffff8c6e2360 RDI: ffffffff8c6e2320
RBP: 0000000000000001 R08: ffffffff81f5d602 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f42939 R12: dffffc0000000000
R13: 1ffff1100eb9a098 R14: 0000000c77c6d408 R15: ffffffff81f5d602
FS:  0000000000000000(0000) GS:ffff888123bad000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86a058ebbc CR3: 000000000fb48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 security_inode_free+0xdc/0x180 security/security.c:1289
 __destroy_inode+0x2a1/0x630 fs/inode.c:363
 destroy_inode fs/inode.c:386 [inline]
 evict+0x8d4/0xb50 fs/inode.c:847
 dispose_list fs/inode.c:865 [inline]
 evict_inodes+0x844/0x8c0 fs/inode.c:918
 generic_shutdown_super+0xaa/0x2d0 fs/super.c:737
 kill_block_super+0x44/0xa0 fs/super.c:1914
 deactivate_locked_super+0xbe/0x110 fs/super.c:586
 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1392
 task_work_run+0x1d9/0x260 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x705/0x2380 kernel/exit.c:980
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
 __do_sys_exit_group kernel/exit.c:1134 [inline]
 __se_sys_exit_group kernel/exit.c:1132 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1132
 x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86a052dac5
Code: Unable to access opcode bytes at 0x7f86a052da9b.
RSP: 002b:00007ffcb03fbdc8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f86a052dac5
RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 0000000000000001
R13: 00007f86a05c6110 R14: 00007f86a05c86a8 R15: 00007f86a05c86c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bpf_inode_storage_free+0x1f4/0x5c0 kernel/bpf/bpf_inode_storage.c:67
Code: d2 c1 d2 ff c6 05 75 65 6d 0f 01 48 c7 c7 60 3f 17 8c be 53 03 00 00 48 c7 c2 a0 3f 17 8c e8 c3 21 ae ff 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 8d b0 45 00 4d 8b 36 e8 d5 24 f9
RSP: 0018:ffffc90003a6f8f0 EFLAGS: 00010206
RAX: 000000018ef8da81 RBX: ffff888075cd04c0 RCX: ffff888075cd0000
RDX: 0000000000000000 RSI: ffffffff8c6e2360 RDI: ffffffff8c6e2320
RBP: 0000000000000001 R08: ffffffff81f5d602 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f42939 R12: dffffc0000000000
R13: 1ffff1100eb9a098 R14: 0000000c77c6d408 R15: ffffffff81f5d602
FS:  0000000000000000(0000) GS:ffff888123bad000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86a058ebbc CR3: 000000000fb48000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	d2 c1                	rol    %cl,%cl
   2:	d2 ff                	sar    %cl,%bh
   4:	c6 05 75 65 6d 0f 01 	movb   $0x1,0xf6d6575(%rip)        # 0xf6d6580
   b:	48 c7 c7 60 3f 17 8c 	mov    $0xffffffff8c173f60,%rdi
  12:	be 53 03 00 00       	mov    $0x353,%esi
  17:	48 c7 c2 a0 3f 17 8c 	mov    $0xffffffff8c173fa0,%rdx
  1e:	e8 c3 21 ae ff       	call   0xffae21e6
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 8d b0 45 00       	call   0x45b0c6
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	e8                   	.byte 0xe8
  3d:	d5 24 f9             	{rex2 0x24} stc

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/11 03:35 linux-next becb95e45ef0 4f92358f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root general protection fault in bpf_inode_storage_free
2026/10/10 08:34 upstream fc1c25014ff8 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in bpf_inode_storage_free
2026/10/10 08:26 upstream fc1c25014ff8 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in bpf_inode_storage_free
2026/10/11 01:30 linux-next becb95e45ef0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in bpf_inode_storage_free
* Struck through repros no longer work on HEAD.