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================================================================== BUG: KCSAN: data-race in del_timer / detach_if_pending write to 0xffff8881218b89b8 of 8 bytes by task 9808 on cpu 1: __hlist_del include/linux/list.h:764 [inline] detach_timer kernel/time/timer.c:815 [inline] detach_if_pending+0xcd/0x290 kernel/time/timer.c:832 del_timer kernel/time/timer.c:1200 [inline] del_timer+0x67/0xb0 kernel/time/timer.c:1190 try_to_grab_pending+0x22d/0x3e0 kernel/workqueue.c:1246 mod_delayed_work_on+0x50/0x100 kernel/workqueue.c:1703 mod_delayed_work include/linux/workqueue.h:524 [inline] wb_queue_work+0x11a/0x290 fs/fs-writeback.c:188 bdi_split_work_to_wbs+0x39d/0x6b0 fs/fs-writeback.c:876 __writeback_inodes_sb_nr+0x192/0x1e0 fs/fs-writeback.c:2468 try_to_writeback_inodes_sb+0x70/0x90 fs/fs-writeback.c:2517 ext4_nonda_switch+0x12d/0x140 fs/ext4/inode.c:2897 ext4_page_mkwrite+0x8c0/0xe50 fs/ext4/inode.c:5900 do_page_mkwrite+0x100/0x210 mm/memory.c:2276 wp_page_shared mm/memory.c:2603 [inline] do_wp_page+0xbf5/0xeb0 mm/memory.c:2715 handle_pte_fault mm/memory.c:3961 [inline] __handle_mm_fault+0x1d16/0x2e00 mm/memory.c:4075 handle_mm_fault+0x21b/0x530 mm/memory.c:4112 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 read to 0xffff8881218b89b8 of 8 bytes by task 9700 on cpu 0: del_timer+0x3b/0xb0 kernel/time/timer.c:1198 try_to_grab_pending+0x22d/0x3e0 kernel/workqueue.c:1246 mod_delayed_work_on+0x50/0x100 kernel/workqueue.c:1703 mod_delayed_work include/linux/workqueue.h:524 [inline] wb_queue_work+0x11a/0x290 fs/fs-writeback.c:188 bdi_split_work_to_wbs+0x39d/0x6b0 fs/fs-writeback.c:876 __writeback_inodes_sb_nr+0x192/0x1e0 fs/fs-writeback.c:2468 try_to_writeback_inodes_sb+0x70/0x90 fs/fs-writeback.c:2517 ext4_nonda_switch+0x12d/0x140 fs/ext4/inode.c:2897 ext4_da_write_begin+0xc5/0x840 fs/ext4/inode.c:2938 generic_perform_write+0x136/0x320 mm/filemap.c:3309 ext4_buffered_write_iter+0x143/0x290 fs/ext4/file.c:252 ext4_file_write_iter+0xf4/0xd40 fs/ext4/file.c:547 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9700 Comm: syz-executor.5 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2020/01/17 03:11 | https://github.com/google/ktsan.git kcsan | 245a43005292 | 3de7aabb | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2020/01/02 13:17 | https://github.com/google/ktsan.git kcsan | 245a43005292 | 25a0186e | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2019/12/24 16:20 | https://github.com/google/ktsan.git kcsan | 245a43005292 | be5c2c81 | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2019/12/21 10:32 | https://github.com/google/ktsan.git kcsan | 245a43005292 | bc586918 | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2019/12/20 04:20 | https://github.com/google/ktsan.git kcsan | 245a43005292 | 36650b4b | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2019/12/04 16:53 | https://github.com/google/ktsan.git kcsan | ef798c30ba4e | b2088328 | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2019/11/19 15:51 | https://github.com/google/ktsan.git kcsan | 5863cc791e4c | 432c7650 | .config | console log | report | ci2-upstream-kcsan-gce | |||||
2019/11/04 08:40 | https://github.com/google/ktsan.git kcsan | 05f2236801fe | b35fad31 | .config | console log | report | ci2-upstream-kcsan-gce |