On Fri, 2 May 2025 03:26:20 +0000 "huk23@xxxxxxxxxxxxxx" <huk23@xxxxxxxxxxxxxx> wrote: > Dear Maintainers， > Let's Cc the gfs2 developers. Do you know if this is reproducible on any other filesystem? > > When using our customized Syzkaller to fuzz the latest Linux kernel, the following crash (37th and 76th)was triggered. > > > 37th： > HEAD commit: 6537cfb395f352782918d8ee7b7f10ba2cc3cbf2 > git tree: upstream > Output:https://github.com/pghk13/Kernel-Bug/blob/main/1220_6.13rc_KASAN/2.%E5%9B%9E%E5%BD%92-11/14-KASAN_%20slab-out-of-bounds%20Read%20in%20hfsplus_bnode_read/14call_trace.txt > Kernel config:https://github.com/pghk13/Kernel-Bug/blob/main/0305_6.15rc1/config.txt > C reproducer:https://github.com/pghk13/Kernel-Bug/blob/main/0219_6.13rc7_todo/76-UBSAN_%20shift-out-of-bounds%20in%20bch2_trans_iter_init_outlined/37repro.c > Syzlang reproducer: https://github.com/pghk13/Kernel-Bug/blob/main/0219_6.13rc7_todo/76-UBSAN_%20shift-out-of-bounds%20in%20bch2_trans_iter_init_outlined/37repro.txt > > 76th： > HEAD commit: 6537cfb395f352782918d8ee7b7f10ba2cc3cbf2 > git tree: upstream > Output:https://github.com/pghk13/Kernel-Bug/blob/main/0219_6.13rc7_todo/76-UBSAN_%20shift-out-of-bounds%20in%20bch2_trans_iter_init_outlined/76call_trace.txt > Kernel config:https://github.com/pghk13/Kernel-Bug/blob/main/0305_6.15rc1/config.txt > C reproducer:https://github.com/pghk13/Kernel-Bug/blob/main/0219_6.13rc7_todo/76-UBSAN_%20shift-out-of-bounds%20in%20bch2_trans_iter_init_outlined/76repro.c > Syzlang reproducer: https://github.com/pghk13/Kernel-Bug/blob/main/0219_6.13rc7_todo/76-UBSAN_%20shift-out-of-bounds%20in%20bch2_trans_iter_init_outlined/76repro.txt > > > > The two errors seem to have the same error points, but there are a few differences in the process. They all trigger warnings in the __folio_mark_dirty+0xb50/0xf10 function of backing-dev.h:251. In __folio_mark_dirty function, a warning is triggered when the code tries to access or modify the backing-dev information. The 76th call stack has longer call chains from file writebacks: writeback work queues → writeback inodes → GFS2 write inodes → log refreshes. > We have reproduced this issue several times on 6.15-rc1 again. > > > > > If you fix this issue, please add the following tag to the commit: > Reported-by: Kun Hu <huk23@xxxxxxxxxxxxxx>, Jiaji Qin <jjtan24@xxxxxxxxxxxxxx>, Shuoran Bai <baishuoran@xxxxxxxxxxxx> > > > > 37th： > ================================================================== > WARNING: CPU: 2 PID: 9494 at ./include/linux/backing-dev.h:251 __folio_mark_dirty+0xb50/0xf10 > Modules linked in: > CPU: 2 UID: 0 PID: 9494 Comm: gfs2_logd/syz:s Not tainted 6.15.0-rc1 #1 PREEMPT(full) > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 > RIP: 0010:__folio_mark_dirty+0xb50/0xf10 > Code: ff ff 48 8d 78 70 e8 af e3 76 09 31 ff 89 c6 89 44 24 08 e8 72 d3 c5 ff 8b 44 24 08 85 c0 0f 85 af f9 ff ff e8 51 d1 c5 ff 90 <0f> 0b 90 e9 a1 f9 ff ff e8 43 d1 c5 ff 90 0f 0b 90 e9 59 f5 ff ff > RSP: 0018:ffffc90014bb7b18 EFLAGS: 00010046 > RAX: 0000000000000000 RBX: ffff88804298cb58 RCX: ffffffff81f5408e > RDX: 0000000000000000 RSI: ffff888023edc900 RDI: 0000000000000002 > RBP: ffffea00015c9d80 R08: 0000000000000000 R09: ffffed10085319a0 > R10: ffffed100853199f R11: ffff88804298ccff R12: 0000000000000246 > R13: ffff888049bd8bc8 R14: 0000000000000001 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff888097c6b000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ff2c7be9028 CR3: 000000000e180000 CR4: 0000000000750ef0 > PKRU: 55555554 > Call Trace: > <TASK> > mark_buffer_dirty+0x358/0x410 > gfs2_unpin+0x106/0xef0 > buf_lo_after_commit+0x155/0x230 > gfs2_log_flush+0xd95/0x2cb0 > gfs2_logd+0x29b/0x12c0 > kthread+0x447/0x8a0 > ret_from_fork+0x48/0x80 > ret_from_fork_asm+0x1a/0x30 > </TASK> > extracting prog: 1h56m11.644263162s > minimizing prog: 14m12.695891417s > simplifying prog options: 0s > extracting C: 32.234365976s > simplifying C: 9m50.565845853s > > > > > > 76th： > ================================================================== > WARNING: CPU: 3 PID: 3051 at ./include/linux/backing-dev.h:251 __folio_mark_dirty+0xb50/0xf10 > Modules linked in: > CPU: 3 UID: 0 PID: 3051 Comm: kworker/u18:5 Not tainted 6.15.0-rc1 #1 PREEMPT(full) > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 > Workqueue: writeback wb_workfn (flush-7:0) > RIP: 0010:__folio_mark_dirty+0xb50/0xf10 > Code: ff ff 48 8d 78 70 e8 af e3 76 09 31 ff 89 c6 89 44 24 08 e8 72 d3 c5 ff 8b 44 24 08 85 c0 0f 85 af f9 ff ff e8 51 d1 c5 ff 90 <0f> 0b 90 e9 a1 f9 ff ff e8 43 d1 c5 ff 90 0f 0b 90 e9 59 f5 ff ff > RSP: 0018:ffffc90011e2f410 EFLAGS: 00010046 > RAX: 0000000000000000 RBX: ffff88804266bfd8 RCX: ffffffff81f5408e > RDX: 0000000000000000 RSI: ffff888043e48000 RDI: 0000000000000002 > RBP: ffffea000086e9c0 R08: 0000000000000000 R09: ffffed10084cd830 > R10: ffffed10084cd82f R11: ffff88804266c17f R12: 0000000000000246 > R13: ffff888012bf87f0 R14: 0000000000000001 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff8880eb46b000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f6410e8e140 CR3: 0000000023648000 CR4: 0000000000750ef0 > PKRU: 55555554 > Call Trace: > <TASK> > mark_buffer_dirty+0x358/0x410 > gfs2_unpin+0x106/0xef0 > buf_lo_after_commit+0x155/0x230 > gfs2_log_flush+0xd95/0x2cb0 > gfs2_write_inode+0x371/0x450 > __writeback_single_inode+0xad7/0xf50 > writeback_sb_inodes+0x5f5/0xee0 > __writeback_inodes_wb+0xbe/0x270 > wb_writeback+0x728/0xb50 > wb_workfn+0x96e/0xe90 > process_scheduled_works+0x5de/0x1bd0 > worker_thread+0x5a9/0xd10 > kthread+0x447/0x8a0 > ret_from_fork+0x48/0x80 > ret_from_fork_asm+0x1a/0x30 > </TASK> > > > > thanks, > Kun Hu >
