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:mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=6Rt/j2m5iB4iOAbkeEaHosgKr0ByKeDsLnufZ+JGsXc=; b=DLKklVyhnoam2rLVHn4l9SqKeSLT+AmXKRDmFSv2uN3ytQBYFM5iiSA8ZrRSpbcFOk FU7muHXyypjfF09/+zj2NoojeW+QfDIkUgRGXfolfMbdUewGUrN1ud0pmqfKz63taKp9 W4MbuaP3Z9Gcmrd4O7iAPTHEabIQblAaVC8sstkBD9QupxumKw7suY7FzCt5/epfj2Pv LyzJUTzUIt/YpACJBz0GixRCCW8acHCI93+lLndCkVqP72kNHZ4Uoty/oKqFA8KbWTna IZKfAhD5RjIIJc5jWf/BX5RrI7QZTKts3bUWGapvOXjV2ui0ghMCpvhW5awfoH/mgqmD pODQ== X-Gm-Message-State: AOJu0YxZl6c5PUVFLFjsC4LXUwe6H6SIsdGWz8a20Y4jbLxy4KdfhWVB VoTDNZkOfVr11hFK6szgwZBJFEfZMu7JQlWFfLST2SzAXsfOjYnOFlb/GtPqwjxmqPOUBHgP9Rl qb3nnAhIrAXWCpS2RGU8OxOmlwLolVRb/3jFAicwYYBO181JTy2FYdKyMAF8= Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c8a:b0:6a3:d77e:725a with SMTP id 006d021491bc7-6a5366d871dmr9219261eaf.20.1784626358567; Tue, 21 Jul 2026 02:32:38 -0700 (PDT) Date: Tue, 21 Jul 2026 02:32:38 -0700 In-Reply-To: <40d9021a-6a93-43a1-97b0-6ec2f9cbabc6@mail.kernel.org> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a5f3cb6.83245ca4.2d5e11.0000.GAE@google.com> Subject: [syzbot ci] Re: fuse: abort connection on /dev/fuse flush to prevent deadlock From: syzbot ci To: kusaram@devineni.in, syzbot@kernel.org, syzbot@lists.linux.dev, syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v3] fuse: abort connection on /dev/fuse flush to prevent deadlock https://lore.kernel.org/all/40d9021a-6a93-43a1-97b0-6ec2f9cbabc6@mail.kernel.org * [PATCH RFC v3] fuse: abort connection on /dev/fuse flush to prevent deadlock and found the following issue: general protection fault in fasync_remove_entry Full report is available here: https://ci.syzbot.org/series/a9dcb2cb-0ef5-4576-84ff-c40a48e2a25a *** general protection fault in fasync_remove_entry tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 8cdeaa50eae8dad34885515f62559ee83e7e8dda arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/be2f3b2c-a8ca-4791-b9dd-8f1f9d24d9e9/config syz repro: https://ci.syzbot.org/findings/0c2890de-1b7a-4718-a188-a597ff4d74a7/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000026: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000130-0x0000000000000137] CPU: 0 UID: 0 PID: 5854 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:fasync_remove_entry+0x3e/0x1c0 fs/fcntl.c:1008 Code: 49 bd 00 00 00 00 00 fc ff df e8 fd 44 7a ff 48 89 df e8 05 2e 85 09 48 c7 c7 80 65 cd 8e e8 f9 2d 85 09 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 a3 cf e7 ff 4d 8b 3e 4d 85 ff 74 RSP: 0018:ffffc900035efd38 EFLAGS: 00010202 RAX: 0000000000000026 RBX: ffff888174b8cc00 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900035efcc0 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006bdf98 R12: ffff88810270ab80 R13: dffffc0000000000 R14: 0000000000000131 R15: ffffffff8c29b708 FS: 0000555569119500(0000) GS:ffff88818d959000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000080 CR3: 0000000102f90000 CR4: 00000000000006f0 Call Trace: __fput+0x88d/0xa50 fs/file_table.c:509 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:70 [inline] exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101 __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:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc7bcb9de99 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:00007ffe628b3f98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffe628b4080 RCX: 00007fc7bcb9de99 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000001302f R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b32a20000 R11: 0000000000000246 R12: 00007ffe628b40c0 R13: 00007fc7bce25fac R14: 000000000001306b R15: 00007fc7bce25fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fasync_remove_entry+0x3e/0x1c0 fs/fcntl.c:1008 Code: 49 bd 00 00 00 00 00 fc ff df e8 fd 44 7a ff 48 89 df e8 05 2e 85 09 48 c7 c7 80 65 cd 8e e8 f9 2d 85 09 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 a3 cf e7 ff 4d 8b 3e 4d 85 ff 74 RSP: 0018:ffffc900035efd38 EFLAGS: 00010202 RAX: 0000000000000026 RBX: ffff888174b8cc00 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900035efcc0 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520006bdf98 R12: ffff88810270ab80 R13: dffffc0000000000 R14: 0000000000000131 R15: ffffffff8c29b708 FS: 0000555569119500(0000) GS:ffff88818d959000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000080 CR3: 0000000102f90000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 7: fc ff df a: e8 fd 44 7a ff call 0xff7a450c f: 48 89 df mov %rbx,%rdi 12: e8 05 2e 85 09 call 0x9852e1c 17: 48 c7 c7 80 65 cd 8e mov $0xffffffff8ecd6580,%rdi 1e: e8 f9 2d 85 09 call 0x9852e1c 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 a3 cf e7 ff call 0xffe7cfdc 39: 4d 8b 3e mov (%r14),%r15 3c: 4d 85 ff test %r15,%r15 3f: 74 .byte 0x74 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.