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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi guys, We are hitting the same crash frequently recently with the latest kernel when testing kceph, and the call trace will be something likes: [ 1580.034891] usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-192' (offset 82, size 499712)!^M [ 1580.045866] ------------[ cut here ]------------^M [ 1580.050551] kernel BUG at mm/usercopy.c:102!^M ^M Entering kdb (current=0xffff8881211f5500, pid 172901) on processor 4 Oops: (null)^M due to oops @ 0xffffffff8138cabd^M CPU: 4 PID: 172901 Comm: fsstress Tainted: G S 6.6.0-g623393c9d50c #1^M Hardware name: Supermicro SYS-5018R-WR/X10SRW-F, BIOS 1.0c 09/07/2015^M RIP: 0010:usercopy_abort+0x6d/0x80^M Code: 4c 0f 44 d0 41 53 48 c7 c0 1c e9 13 82 48 c7 c6 71 62 13 82 48 0f 45 f0 48 89 f9 48 c7 c7 f0 6b 1b 82 4c 89 d2 e8 63 2b df ff <0f> 0b 49 c7 c1 44 c8 14 82 4d 89 cb 4d 89 c8 eb a5 66 90 f3 0f 1e^M RSP: 0018:ffffc90006dfba88 EFLAGS: 00010246^M RAX: 000000000000006a RBX: 000000000007a000 RCX: 0000000000000000^M RDX: 0000000000000000 RSI: ffff88885fd1d880 RDI: ffff88885fd1d880^M RBP: 000000000007a000 R08: 0000000000000000 R09: c0000000ffffdfff^M R10: 0000000000000001 R11: ffffc90006dfb930 R12: 0000000000000001^M R13: ffff8882b7bbed12 R14: ffff88827a375830 R15: ffff8882b7b44d12^M FS:  00007fb24c859500(0000) GS:ffff88885fd00000(0000) knlGS:0000000000000000^M CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033^M CR2: 000055c2bcf9eb00 CR3: 000000028956c005 CR4: 00000000001706e0^M Call Trace:^M  ^M  ? kdb_main_loop+0x32c/0xa10^M  ? kdb_stub+0x216/0x420^M more> You can see more detail in ceph tracker https://tracker.ceph.com/issues/64471. I have seen someone has reported a similar issue one year ago but that has been fixed already, please see https://lore.kernel.org/linux-mm/CANn89iLaWZhrfyn8NBzdN1zQC0d47WC4_jvpwKQPoHwyCVueVQ@mail.gmail.com/T/. Is it a known issue ? Thanks - Xiubo