On Fri, Nov 29, 2019 at 1:45 PM Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > > 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 Another one that looks related: BUG: sleeping function called from invalid context at mm/page_alloc.c:4681 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 15087, name: syz-executor.7 3 locks held by syz-executor.7/15087: #0: ffff888024542110 (sk_lock-AF_PACKET){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff888024542110 (sk_lock-AF_PACKET){+.+.}, at: packet_setsockopt+0xdf1/0x2d90 net/packet/af_packet.c:3678 #1: ffffffff89850a80 (vmap_purge_lock){+.+.}, at: try_purge_vmap_area_lazy mm/vmalloc.c:1331 [inline] #1: ffffffff89850a80 (vmap_purge_lock){+.+.}, at: free_vmap_area_noflush+0x2a8/0x390 mm/vmalloc.c:1368 #2: ffffffff89850c18 (free_vmap_area_lock){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline] #2: ffffffff89850c18 (free_vmap_area_lock){+.+.}, at: __purge_vmap_area_lazy+0x19c/0x1f30 mm/vmalloc.c:1298 Preemption disabled at: [<ffffffff81a78ddc>] spin_lock include/linux/spinlock.h:338 [inline] [<ffffffff81a78ddc>] __purge_vmap_area_lazy+0x19c/0x1f30 mm/vmalloc.c:1298 CPU: 3 PID: 15087 Comm: syz-executor.7 Not tainted 5.4.0-next-20191129+ #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x199/0x216 lib/dump_stack.c:118 ___might_sleep.cold.97+0x1f5/0x238 kernel/sched/core.c:6800 __might_sleep+0x95/0x190 kernel/sched/core.c:6753 prepare_alloc_pages mm/page_alloc.c:4681 [inline] __alloc_pages_nodemask+0x3cd/0x890 mm/page_alloc.c:4730 alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2211 alloc_pages include/linux/gfp.h:532 [inline] __get_free_pages+0xc/0x40 mm/page_alloc.c:4786 __pte_alloc_one_kernel include/asm-generic/pgalloc.h:21 [inline] pte_alloc_one_kernel include/asm-generic/pgalloc.h:33 [inline] __pte_alloc_kernel+0x1d/0x200 mm/memory.c:459 apply_to_pte_range mm/memory.c:2031 [inline] apply_to_pmd_range mm/memory.c:2068 [inline] apply_to_pud_range mm/memory.c:2088 [inline] apply_to_p4d_range mm/memory.c:2108 [inline] apply_to_page_range+0x77d/0xa00 mm/memory.c:2133 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/common.c:970 __purge_vmap_area_lazy+0xcbb/0x1f30 mm/vmalloc.c:1313 try_purge_vmap_area_lazy mm/vmalloc.c:1332 [inline] free_vmap_area_noflush+0x2ca/0x390 mm/vmalloc.c:1368 free_unmap_vmap_area mm/vmalloc.c:1381 [inline] remove_vm_area+0x1cc/0x230 mm/vmalloc.c:2209 vm_remove_mappings mm/vmalloc.c:2236 [inline] __vunmap+0x223/0xa20 mm/vmalloc.c:2299 __vfree+0x3f/0xd0 mm/vmalloc.c:2356 __vmalloc_area_node mm/vmalloc.c:2507 [inline] __vmalloc_node_range+0x5d5/0x810 mm/vmalloc.c:2547 __vmalloc_node mm/vmalloc.c:2607 [inline] __vmalloc_node_flags mm/vmalloc.c:2621 [inline] vzalloc+0x6f/0x80 mm/vmalloc.c:2666 alloc_one_pg_vec_page net/packet/af_packet.c:4233 [inline] alloc_pg_vec net/packet/af_packet.c:4258 [inline] packet_set_ring+0xbc0/0x1b50 net/packet/af_packet.c:4342 packet_setsockopt+0xed7/0x2d90 net/packet/af_packet.c:3695 __sys_setsockopt+0x29b/0x4d0 net/socket.c:2117 __do_sys_setsockopt net/socket.c:2133 [inline] __se_sys_setsockopt net/socket.c:2130 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2130 do_syscall_64+0xfa/0x780 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465fe9 Code: Bad RIP value. RSP: 002b:00007ff70087dc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000465fe9 RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000004 RBP: 00000000ffffffff R08: 000000000000001c R09: 0000000000000000 R10: 0000000020000040 R11: 0000000000000246 R12: 00000000004a643a R13: 00000000004f2620 R14: 00000000004af7e6 R15: 00007ff70087e6bc BUG: scheduling while atomic: syz-executor.7/15087/0x00000002 3 locks held by syz-executor.7/15087: #0: ffff888024542110 (sk_lock-AF_PACKET){+.+.}, at: lock_sock include/net/sock.h:1526 [inline] #0: ffff888024542110 (sk_lock-AF_PACKET){+.+.}, at: packet_setsockopt+0xdf1/0x2d90 net/packet/af_packet.c:3678 #1: ffffffff89850a80 (vmap_purge_lock){+.+.}, at: try_purge_vmap_area_lazy mm/vmalloc.c:1331 [inline] #1: ffffffff89850a80 (vmap_purge_lock){+.+.}, at: free_vmap_area_noflush+0x2a8/0x390 mm/vmalloc.c:1368 #2: ffffffff89850c18 (free_vmap_area_lock){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline] #2: ffffffff89850c18 (free_vmap_area_lock){+.+.}, at: __purge_vmap_area_lazy+0x19c/0x1f30 mm/vmalloc.c:1298 Modules linked in: Preemption disabled at: [<ffffffff81a78ddc>] spin_lock include/linux/spinlock.h:338 [inline] [<ffffffff81a78ddc>] __purge_vmap_area_lazy+0x19c/0x1f30 mm/vmalloc.c:1298
