syzbot


KCSAN: data-race in __filemap_remove_folio / folio_mapping (2)

Status: upstream: reported on 2023/04/24 07:19
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+606f94dfeaaa45124c90@syzkaller.appspotmail.com
First crash: 1112d, last: 4h18m
Discussions (14)
Title Replies (including bot) Last reply
[syzbot] Monthly mm report (Sep 2025) 0 (1) 2025/09/15 06:54
[syzbot] Monthly mm report (Aug 2025) 0 (1) 2025/08/14 12:42
[syzbot] Monthly mm report (Jul 2025) 0 (1) 2025/07/14 07:23
[syzbot] Monthly mm report (Jun 2025) 0 (1) 2025/06/13 12:25
[syzbot] Monthly mm report (May 2025) 0 (1) 2025/05/12 13:34
[syzbot] Monthly mm report (Apr 2025) 0 (1) 2025/04/09 07:11
[syzbot] Monthly mm report (Oct 2024) 0 (1) 2024/10/03 09:02
[syzbot] Monthly mm report (Sep 2024) 0 (1) 2024/09/02 08:17
[syzbot] [fs?] [mm?] KCSAN: data-race in __filemap_remove_folio / folio_mapping (2) 6 (8) 2024/04/18 04:27
[syzbot] Monthly mm report (Feb 2024) 0 (1) 2024/02/17 20:23
[syzbot] Monthly mm report (Nov 2023) 0 (1) 2023/11/15 03:00
[syzbot] Monthly mm report (Sep 2023) 0 (1) 2023/09/11 10:07
[syzbot] Monthly xfs report (Aug 2023) 0 (1) 2023/08/07 08:36
[syzbot] Monthly xfs report (Jun 2023) 0 (1) 2023/06/07 09:24
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __filemap_remove_folio / folio_mapping block 6 42 1320d 1383d 0/29 auto-closed as invalid on 2022/04/21 14:11

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea00048dcf98 of 8 bytes by task 7580 on cpu 1:
 page_cache_delete mm/filemap.c:144 [inline]
 __filemap_remove_folio+0x1a5/0x2a0 mm/filemap.c:227
 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:256
 truncate_inode_folio+0x42/0x50 mm/truncate.c:176
 shmem_undo_range+0x244/0xa80 mm/shmem.c:1116
 shmem_truncate_range mm/shmem.c:1232 [inline]
 shmem_evict_inode+0x134/0x520 mm/shmem.c:1360
 evict+0x2e3/0x550 fs/inode.c:810
 iput_final fs/inode.c:1914 [inline]
 iput+0x4ed/0x650 fs/inode.c:1966
 dentry_unlink_inode+0x24f/0x260 fs/dcache.c:466
 __dentry_kill+0x18d/0x4b0 fs/dcache.c:669
 dput+0x5e/0xd0 fs/dcache.c:911
 __fput+0x444/0x650 fs/file_table.c:476
 ____fput+0x1c/0x30 fs/file_table.c:496
 task_work_run+0x131/0x1a0 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x483/0x15c0 kernel/exit.c:966
 do_group_exit+0xff/0x140 kernel/exit.c:1107
 get_signal+0xe58/0xf70 kernel/signal.c:3034
 arch_do_signal_or_restart+0x96/0x440 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x5b/0xa0 kernel/entry/common.c:73
 irqentry_exit+0x12/0x50 kernel/entry/common.c:191
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

read to 0xffffea00048dcf98 of 8 bytes by task 7756 on cpu 0:
 folio_mapping+0xa1/0xe0 mm/util.c:703
 folio_evictable mm/internal.h:499 [inline]
 evict_folios+0x2b4b/0x3590 mm/vmscan.c:4755
 try_to_shrink_lruvec+0x5b5/0x950 mm/vmscan.c:4908
 lru_gen_shrink_lruvec mm/vmscan.c:5057 [inline]
 shrink_lruvec+0x22e/0x1b50 mm/vmscan.c:5818
 shrink_node_memcgs mm/vmscan.c:6054 [inline]
 shrink_node+0x686/0x2120 mm/vmscan.c:6095
 shrink_zones mm/vmscan.c:6339 [inline]
 do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6401
 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6729
 try_charge_memcg+0x383/0xa10 mm/memcontrol.c:2356
 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2799
 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2843
 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5200
 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2507
 vm_area_alloc_pages mm/vmalloc.c:3647 [inline]
 __vmalloc_area_node mm/vmalloc.c:3724 [inline]
 __vmalloc_node_range_noprof+0x7a5/0xed0 mm/vmalloc.c:3897
 __kvmalloc_node_noprof+0x483/0x670 mm/slub.c:7122
 ip_set_alloc+0x24/0x30 net/netfilter/ipset/ip_set_core.c:261
 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568
 ip_set_create+0x3cc/0x970 net/netfilter/ipset/ip_set_core.c:1109
 nfnetlink_rcv_msg+0x4c6/0x590 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2552
 nfnetlink_rcv+0x167/0x16c0 net/netfilter/nfnetlink.c:669
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x145/0x180 net/socket.c:742
 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2630
 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2719
 x64_sys_call+0x191e/0x3000 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881040ea1e8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7756 Comm: syz.0.1541 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
==================================================================
syz.0.1541 (7756) used greatest stack depth: 6184 bytes left

Crashes (769):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/27 20:28 upstream dcb6fa37fd7b fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/26 03:34 upstream 72761a7e3122 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/25 16:40 upstream 566771afc7a8 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/25 00:51 upstream d2818517e348 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/24 16:30 upstream 6fab32bb6508 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/23 22:48 upstream 266ee584e55e c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/23 01:31 upstream dd72c8fcf6d3 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/22 14:43 upstream 552c50713f27 252fbbad .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/21 23:47 upstream 552c50713f27 9832ed61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/21 19:08 upstream 6548d364a3e8 9832ed61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/20 19:21 upstream 211ddde0823f d422939c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/19 01:46 upstream 1c64efcb083c 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/17 07:54 upstream 98ac9cc4b445 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/15 22:02 upstream 1f4a222b0e33 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/15 06:00 upstream 9b332cece987 b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/13 07:57 upstream 3a8660878839 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/12 21:01 upstream 8765f467912f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/12 09:15 upstream 67029a49db6c ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/11 01:53 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/10 04:38 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/09 21:21 upstream ec714e371f22 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/09 02:39 upstream cd5a0afbdf80 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/08 11:41 upstream 0d97f2067c16 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/07 17:15 upstream 971199ad2a0f 8ef35d49 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/06 12:30 upstream fd94619c4336 91305dbe .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/05 04:50 upstream d104e3d17f7b 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/04 13:57 upstream cbf33b8e0b36 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/04 04:04 upstream 9b0d551bcc05 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/03 10:49 upstream e406d57be7bd 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/02 17:27 upstream 7f7072574127 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/02 04:47 upstream 080ffb4bec4d 267f56c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/10/01 16:33 upstream 50c19e20ed2e a1859138 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/30 23:13 upstream 30d4efb2f5a5 65a0eece .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/30 00:55 upstream 1896ce8eb6c6 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/28 19:13 upstream 8f9736633f8c 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/28 00:54 upstream 51a24b7deaae 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/27 11:59 upstream fec734e8d564 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/26 22:52 upstream 083fc6d7fa0d 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/25 23:24 upstream 4ff71af020ae 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/25 11:31 upstream bf40f4b87761 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/24 23:50 upstream 4ea5af085908 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/24 05:59 upstream cec1e6e5d1ab 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/23 16:55 upstream cec1e6e5d1ab e667a34f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/22 23:31 upstream cec1e6e5d1ab 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/21 20:59 upstream 2d5bd41a4505 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/21 07:47 upstream f975f08c2e89 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/20 18:03 upstream 3b08f56fbbb9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/20 01:26 upstream cd89d487374c 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2025/09/19 06:08 upstream cbf658dd0941 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2023/04/23 07:32 upstream 622322f53c6d 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2023/04/16 16:53 upstream 3e7bb4f24617 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2023/04/10 04:10 upstream 09a9639e56c0 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
2022/10/11 17:24 upstream 60bb8154d1d7 02b6492e .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_remove_folio / folio_mapping
* Struck through repros no longer work on HEAD.