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-0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa0ce0f.f81106d8.285f0a.0008.GAE@google.com> Subject: [moderation/CI] Re: hfsplus: convert regular file I/O to iomap-based operations From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v3] hfsplus: convert regular file I/O to iomap-based operations https://lore.kernel.org/all/20260908210448.296772-1-slava@dubeyko.com * [PATCH v3 1/7] hfs/hfsplus: exchange hardcoded number of extents on named constants * [PATCH v3 2/7] hfsplus: rework hfsplus_get_block() logic * [PATCH v3 3/7] hfsplus: take the bitmap page lock for allocate/free * [PATCH v3 4/7] hfsplus: add iomap operations for regular file data * [PATCH v3 5/7] hfsplus: move file related operations to file.c * [PATCH v3 6/7] hfsplus: introduce iomap-based file_operations * [PATCH v3 7/7] hfsplus: switch address_space_operations on iomap-based support and found the following issue: general protection fault in __bh_submit Full report is available here: https://ci.syzbot.org/series/38a0586d-f4cb-4955-aebf-8908d87645ed *** general protection fault in __bh_submit tree: vfs URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/vfs/vfs.git base: 21860bb220225edeb87e9c831e6bf25c620e2126 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/fca9c940-9a44-4e03-8515-7d438025f0e2/config syz repro: https://ci.syzbot.org/findings/e6b3388b-2033-41f8-b2d7-55ceca2562f6/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 UID: 0 PID: 5002 Comm: jbd2/sda1-8 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:const_folio_flags include/linux/page-flags.h:345 [inline] RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:601 [inline] RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1108 Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 86 e1 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 64 e1 d7 ff 4d 8b 3f 4c 89 fe 48 RSP: 0018:ffffc9000fe07868 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b8b669 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888169ab56a0 RBP: 0000000000009801 R08: ffff888169ab56ff R09: 1ffff1102d356adf R10: dffffc0000000000 R11: ffffed102d356ae0 R12: dffffc0000000000 R13: ffff888169ab5680 R14: ffff88811d795700 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff8882a8cd5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb21ba27dac CR3: 000000000eb48000 CR4: 00000000000006f0 Call Trace: jbd2_journal_commit_transaction+0x22a9/0x5cd0 fs/jbd2/commit.c:751 kjournald2+0x3bc/0x750 fs/jbd2/journal.c:200 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline] RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:601 [inline] RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1108 Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 86 e1 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 64 e1 d7 ff 4d 8b 3f 4c 89 fe 48 RSP: 0018:ffffc9000fe07868 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b8b669 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888169ab56a0 RBP: 0000000000009801 R08: ffff888169ab56ff R09: 1ffff1102d356adf R10: dffffc0000000000 R11: ffffed102d356ae0 R12: dffffc0000000000 R13: ffff888169ab5680 R14: ffff88811d795700 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff8882a8cd5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000035dc4b324000 CR3: 00000001bb4be000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 48 89 44 24 18 mov %rax,0x18(%rsp) 8: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 86 e1 d7 ff call 0xffd7e19d 17: 48 89 5c 24 28 mov %rbx,0x28(%rsp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 4c 8d 7b 08 lea 0x8(%rbx),%r15 23: 4c 89 f8 mov %r15,%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 ff mov %r15,%rdi 34: e8 64 e1 d7 ff call 0xffd7e19d 39: 4d 8b 3f mov (%r15),%r15 3c: 4c 89 fe mov %r15,%rsi 3f: 48 rex.W *** 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 fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported. The email will later be sent to: [brauner@kernel.org djwong@kernel.org frank.li@vivo.com glaubitz@physik.fu-berlin.de hch@lst.de linux-fsdevel@vger.kernel.org linux-kernel@vger.kernel.org slava@dubeyko.com vdubeyko@coreweave.com willy@infradead.org] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid