syzbot

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BUG: KCSAN: data-race in dev_uevent / really_probe

write to 0xffff888137239468 of 8 bytes by task 22356 on cpu 0:
 really_probe+0x9a/0x620 drivers/base/dd.c:632
 __driver_probe_device+0x12d/0x200 drivers/base/dd.c:800
 driver_probe_device+0x38/0x2f0 drivers/base/dd.c:830
 __device_attach_driver+0x213/0x310 drivers/base/dd.c:958
 bus_for_each_drv+0x1ca/0x240 drivers/base/bus.c:457
 __device_attach+0x1c3/0x290 drivers/base/dd.c:1030
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1079
 bus_probe_device+0x13d/0x1c0 drivers/base/bus.c:532
 device_add+0x6a1/0x8b0 drivers/base/core.c:3624
 device_register+0x1d/0x20 drivers/base/core.c:3706
 nsim_bus_dev_new drivers/net/netdevsim/bus.c:290 [inline]
 new_device_store+0x279/0x400 drivers/net/netdevsim/bus.c:167
 bus_attr_store+0x50/0x70 drivers/base/bus.c:170
 sysfs_kf_write+0xaa/0xc0 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x1ca/0x2b0 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:1956 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888137239468 of 8 bytes by task 22312 on cpu 1:
 dev_uevent+0x235/0x360 drivers/base/core.c:2574
 uevent_show+0x102/0x1e0 drivers/base/core.c:2646
 dev_attr_show+0x39/0x90 drivers/base/core.c:2349
 sysfs_kf_seq_show+0x179/0x240 fs/sysfs/file.c:59
 kernfs_seq_show+0x78/0x90 fs/kernfs/file.c:205
 seq_read_iter+0x2bc/0x8f0 fs/seq_file.c:230
 kernfs_fop_read_iter+0xc8/0x2e0 fs/kernfs/file.c:279
 call_read_iter include/linux/fs.h:1950 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x3da/0x5c0 fs/read_write.c:470
 ksys_read+0xeb/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffffffff85cc56f8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22312 Comm: udevd Not tainted 6.6.0-rc4-syzkaller-00012-gce36c8b14987 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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