Hello,
syzbot found the following crash on:
HEAD commit: 05f22368 x86, kcsan: Enable KCSAN for x86
git tree: https://github.com/google/ktsan.git kcsan
console output: https://syzkaller.appspot.com/x/log.txt?x=1296ff50e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=87d111955f40591f
dashboard link: https://syzkaller.appspot.com/bug?extid=99f4ddade3c22ab0cf23
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+99f4ddade3c22ab0cf23@xxxxxxxxxxxxxxxxxxxxxxxxx
==================================================================
BUG: KCSAN: data-race in __rcu_read_unlock / sync_rcu_exp_select_cpus
read to 0xffffffff85a7d440 of 8 bytes by task 7624 on cpu 0:
rcu_read_unlock_special kernel/rcu/tree_plugin.h:615 [inline]
__rcu_read_unlock+0x381/0x3c0 kernel/rcu/tree_plugin.h:383
rcu_read_unlock include/linux/rcupdate.h:652 [inline]
filemap_map_pages+0x5b3/0x990 mm/filemap.c:2687
do_fault_around mm/memory.c:3450 [inline]
do_read_fault mm/memory.c:3484 [inline]
do_fault mm/memory.c:3618 [inline]
handle_pte_fault mm/memory.c:3849 [inline]
__handle_mm_fault+0x2554/0x2cb0 mm/memory.c:3973
handle_mm_fault+0x21b/0x530 mm/memory.c:4010
do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
__do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202
write to 0xffffffff85a7d440 of 8 bytes by task 7353 on cpu 1:
sync_exp_reset_tree kernel/rcu/tree_exp.h:137 [inline]
sync_rcu_exp_select_cpus+0xd5/0x590 kernel/rcu/tree_exp.h:427
rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:575 [inline]
wait_rcu_exp_gp+0x25/0x40 kernel/rcu/tree_exp.h:589
process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
worker_thread+0xa0/0x800 kernel/workqueue.c:2415
kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7353 Comm: kworker/1:0 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: rcu_gp wait_rcu_exp_gp
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7353 Comm: kworker/1:0 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: rcu_gp wait_rcu_exp_gp
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xf5/0x159 lib/dump_stack.c:113
panic+0x210/0x640 kernel/panic.c:221
kcsan_report.cold+0xc/0x10 kernel/kcsan/report.c:302
__kcsan_setup_watchpoint+0x32e/0x4a0 kernel/kcsan/core.c:411
__tsan_write8 kernel/kcsan/kcsan.c:36 [inline]
__tsan_write8+0x32/0x40 kernel/kcsan/kcsan.c:36
sync_exp_reset_tree kernel/rcu/tree_exp.h:137 [inline]
sync_rcu_exp_select_cpus+0xd5/0x590 kernel/rcu/tree_exp.h:427
rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:575 [inline]
wait_rcu_exp_gp+0x25/0x40 kernel/rcu/tree_exp.h:589
process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
worker_thread+0xa0/0x800 kernel/workqueue.c:2415
kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
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