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Fri, 26 Jun 2026 14:13:36 -0700 (PDT) Message-ID: <6a3eeb80.c68533e6.3320fc.f244@mx.google.com> Date: Fri, 26 Jun 2026 14:13:36 -0700 (PDT) Subject: kernel BUG at hfs_write_inode [verbose debug info unavailable] To: slava@dubeyko.com, glaubitz@physik.fu-berlin.de, frank.li@vivo.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Reproducer: Thank you! Best regards, Sanan Hasanov ------------[ cut here ]------------ Kernel BUG at hfs_write_inode+0x8b1/0x8c0 [verbose] Oops: invalid opcode: 0000 [#1] SMP KASAN CPU: 0 UID: 0 PID: 52148 Comm: kworker/u8:18 Tainted: G L 7.0.0-rc1 #1 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: writeback wb_workfn (flush-7:7) RIP: 0010:hfs_write_inode+0x8b1/0x8c0 fs/hfs/inode.c:474 Code: ff e9 c5 fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 61 fe ff ff 4c 89 f7 e8 4a 02 85 ff e9 54 fe ff ff e8 d0 d2 18 ff 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 0f 1f 44 RSP: 0018:ffffc900107e72c0 EFLAGS: 00010293 RAX: ffffffff82a97f00 RBX: ffff88805491a520 RCX: ffff88801ccc2700 RDX: 0000000000000000 RSI: ffffffff8eb6dc00 RDI: 0000000000000000 RBP: ffffc900107e7450 R08: ffff88801ccc2700 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000000 R12: 1ffff920020fce5c R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88805491a4e0 FS: 0000000000000000(0000) GS:ffff8880d98df000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80878c4e78 CR3: 00000000476ce000 CR4: 00000000000006f0 Call Trace: write_inode fs/fs-writeback.c:1581 [inline] __writeback_single_inode+0x56f/0x870 fs/fs-writeback.c:1812 writeback_sb_inodes+0x73b/0x1110 fs/fs-writeback.c:2040 wb_writeback+0x3fa/0x690 fs/fs-writeback.c:2226 wb_do_writeback fs/fs-writeback.c:2373 [inline] wb_workfn+0x3db/0xef0 fs/fs-writeback.c:2413 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0x811/0xf10 kernel/workqueue.c:3358 worker_thread+0x9c1/0xeb0 kernel/workqueue.c:3439 kthread+0x3c1/0x4d0 kernel/kthread.c:467 ret_from_fork+0x608/0xc40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hfs_write_inode+0x8b1/0x8c0 fs/hfs/inode.c:474 Code: ff e9 c5 fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 61 fe ff ff 4c 89 f7 e8 4a 02 85 ff e9 54 fe ff ff e8 d0 d2 18 ff 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 0f 1f 44 RSP: 0018:ffffc900107e72c0 EFLAGS: 00010293 RAX: ffffffff82a97f00 RBX: ffff88805491a520 RCX: ffff88801ccc2700 RDX: 0000000000000000 RSI: ffffffff8eb6dc00 RDI: 0000000000000000 RBP: ffffc900107e7450 R08: ffff88801ccc2700 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000000 R12: 1ffff920020fce5c R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88805491a4e0 FS: 0000000000000000(0000) GS:ffff8880d99df000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb2c2dff0 CR3: 000000003181d000 CR4: 00000000000006f0 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>> Oops: invalid opcode: 0000 [#1] SMP KASAN CPU: 0 UID: 0 PID: 52148 Comm: kworker/u8:18 Tainted: G L 7.0.0-rc1 #1 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: writeback wb_workfn (flush-7:7) RIP: 0010:hfs_write_inode+0x8b1/0x8c0 Code: ff e9 c5 fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 61 fe ff ff 4c 89 f7 e8 4a 02 85 ff e9 54 fe ff ff e8 d0 d2 18 ff 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 0f 1f 44 RSP: 0018:ffffc900107e72c0 EFLAGS: 00010293 RAX: ffffffff82a97f00 RBX: ffff88805491a520 RCX: ffff88801ccc2700 RDX: 0000000000000000 RSI: ffffffff8eb6dc00 RDI: 0000000000000000 RBP: ffffc900107e7450 R08: ffff88801ccc2700 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000000 R12: 1ffff920020fce5c R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88805491a4e0 FS: 0000000000000000(0000) GS:ffff8880d98df000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80878c4e78 CR3: 00000000476ce000 CR4: 00000000000006f0 Call Trace: __writeback_single_inode+0x56f/0x870 writeback_sb_inodes+0x73b/0x1110 wb_writeback+0x3fa/0x690 wb_workfn+0x3db/0xef0 process_scheduled_works+0x811/0xf10 worker_thread+0x9c1/0xeb0 kthread+0x3c1/0x4d0 ret_from_fork+0x608/0xc40 ret_from_fork_asm+0x11/0x20 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hfs_write_inode+0x8b1/0x8c0 Code: ff e9 c5 fd ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 61 fe ff ff 4c 89 f7 e8 4a 02 85 ff e9 54 fe ff ff e8 d0 d2 18 ff 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 0f 1f 44 RSP: 0018:ffffc900107e72c0 EFLAGS: 00010293 RAX: ffffffff82a97f00 RBX: ffff88805491a520 RCX: ffff88801ccc2700 RDX: 0000000000000000 RSI: ffffffff8eb6dc00 RDI: 0000000000000000 RBP: ffffc900107e7450 R08: ffff88801ccc2700 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000000 R12: 1ffff920020fce5c R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88805491a4e0 FS: 0000000000000000(0000) GS:ffff8880d99df000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb2c2dff0 CR3: 000000003181d000 CR4: 00000000000006f0 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>