On Fri, Nov 29, 2019 at 1:29 PM Daniel Axtens <dja@xxxxxxxxxx> wrote: > >>> Nope, it's vm_map_ram() not being handled > >> Another suspicious one. Related to kasan/vmalloc? > > Very likely the same as with ion: > > > > # git grep vm_map_ram|grep xfs > > fs/xfs/xfs_buf.c: * vm_map_ram() will allocate auxiliary structures (e.g. > > fs/xfs/xfs_buf.c: bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, > > Aaargh, that's an embarassing miss. > > It's a bit intricate because kasan_vmalloc_populate function is > currently set up to take a vm_struct not a vmap_area, but I'll see if I > can get something simple out this evening - I'm away for the first part > of next week. > > Do you have to do anything interesting to get it to explode with xfs? Is > it as simple as mounting a drive and doing some I/O? Or do you need to > do something more involved? As simple as running syzkaller :) with this config https://github.com/google/syzkaller/blob/master/dashboard/config/upstream-kasan.config > Regards, > Daniel > > > > >> > >> BUG: unable to handle page fault for address: fffff52005b80000 > >> #PF: supervisor read access in kernel mode > >> #PF: error_code(0x0000) - not-present page > >> PGD 7ffcd067 P4D 7ffcd067 PUD 2cd10067 PMD 66d76067 PTE 0 > >> Oops: 0000 [#1] PREEMPT SMP KASAN > >> CPU: 2 PID: 9211 Comm: syz-executor.2 Not tainted 5.4.0-next-20191129+ #6 > >> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS > >> rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > >> RIP: 0010:xfs_sb_read_verify+0xe9/0x540 fs/xfs/libxfs/xfs_sb.c:691 > >> Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 1e 04 00 00 4d 8b ac 24 > >> 30 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 > >> 04 02 84 c0 74 08 3c 03 0f 8e ad 03 00 00 41 8b 45 00 bf 58 > >> RSP: 0018:ffffc9000a58f8d0 EFLAGS: 00010a06 > >> RAX: dffffc0000000000 RBX: 1ffff920014b1f1d RCX: ffffc9000af42000 > >> RDX: 1ffff92005b80000 RSI: ffffffff82914404 RDI: ffff88805cdb1460 > >> RBP: ffffc9000a58fab0 R08: ffff8880610cd380 R09: ffffed1005a87045 > >> R10: ffffed1005a87044 R11: ffff88802d438223 R12: ffff88805cdb1340 > >> R13: ffffc9002dc00000 R14: ffffc9000a58fa88 R15: ffff888061b5c000 > >> FS: 00007fb49bda9700(0000) GS:ffff88802d400000(0000) knlGS:0000000000000000 > >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >> CR2: fffff52005b80000 CR3: 0000000060769006 CR4: 0000000000760ee0 > >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > >> PKRU: 55555554 > >> Call Trace: > >> xfs_buf_ioend+0x228/0xdc0 fs/xfs/xfs_buf.c:1162 > >> __xfs_buf_submit+0x38b/0xe50 fs/xfs/xfs_buf.c:1485 > >> xfs_buf_submit fs/xfs/xfs_buf.h:268 [inline] > >> xfs_buf_read_uncached+0x15c/0x560 fs/xfs/xfs_buf.c:897 > >> xfs_readsb+0x2d0/0x540 fs/xfs/xfs_mount.c:298 > >> xfs_fc_fill_super+0x3e6/0x11f0 fs/xfs/xfs_super.c:1415 > >> get_tree_bdev+0x444/0x620 fs/super.c:1340 > >> xfs_fc_get_tree+0x1c/0x20 fs/xfs/xfs_super.c:1550 > >> vfs_get_tree+0x8e/0x300 fs/super.c:1545 > >> do_new_mount fs/namespace.c:2822 [inline] > >> do_mount+0x152d/0x1b50 fs/namespace.c:3142 > >> ksys_mount+0x114/0x130 fs/namespace.c:3351 > >> __do_sys_mount fs/namespace.c:3365 [inline] > >> __se_sys_mount fs/namespace.c:3362 [inline] > >> __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 > >> do_syscall_64+0xfa/0x780 arch/x86/entry/common.c:294 > >> entry_SYSCALL_64_after_hwframe+0x49/0xbe > >> RIP: 0033:0x46736a > >> Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f > >> 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d > >> 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 > >> RSP: 002b:00007fb49bda8a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 > >> RAX: ffffffffffffffda RBX: 00007fb49bda8af0 RCX: 000000000046736a > >> RDX: 00007fb49bda8ad0 RSI: 0000000020000140 RDI: 00007fb49bda8af0 > >> RBP: 00007fb49bda8ad0 R08: 00007fb49bda8b30 R09: 00007fb49bda8ad0 > >> R10: 0000000000000000 R11: 0000000000000202 R12: 00007fb49bda8b30 > >> R13: 00000000004b1c60 R14: 00000000004b006d R15: 00007fb49bda96bc > >> Modules linked in: > >> Dumping ftrace buffer: > >> (ftrace buffer empty) > >> CR2: fffff52005b80000 > >> ---[ end trace eddd8949d4c898df ]--- > >> RIP: 0010:xfs_sb_read_verify+0xe9/0x540 fs/xfs/libxfs/xfs_sb.c:691 > >> Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 1e 04 00 00 4d 8b ac 24 > >> 30 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 > >> 04 02 84 c0 74 08 3c 03 0f 8e ad 03 00 00 41 8b 45 00 bf 58 > >> RSP: 0018:ffffc9000a58f8d0 EFLAGS: 00010a06 > >> RAX: dffffc0000000000 RBX: 1ffff920014b1f1d RCX: ffffc9000af42000 > >> RDX: 1ffff92005b80000 RSI: ffffffff82914404 RDI: ffff88805cdb1460 > >> RBP: ffffc9000a58fab0 R08: ffff8880610cd380 R09: ffffed1005a87045 > >> R10: ffffed1005a87044 R11: ffff88802d438223 R12: ffff88805cdb1340 > >> R13: ffffc9002dc00000 R14: ffffc9000a58fa88 R15: ffff888061b5c000 > >> FS: 00007fb49bda9700(0000) GS:ffff88802d400000(0000) knlGS:0000000000000000 > >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >> CR2: fffff52005b80000 CR3: 0000000060769006 CR4: 0000000000760ee0 > >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > >> PKRU: 55555554 > >> > > > > -- > > You received this message because you are subscribed to the Google Groups "kasan-dev" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@xxxxxxxxxxxxxxxx. > > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/56cf8aab-c61b-156c-f681-d2354aed22bb%40virtuozzo.com. > > -- > You received this message because you are subscribed to the Google Groups "kasan-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/871rtqg91q.fsf%40dja-thinkpad.axtens.net.
