On 2/15/23 7:40 PM, John David Anglin wrote: > On 2023-02-15 6:02 p.m., Jens Axboe wrote: >> This is not related to Helge's patch, 6.1-stable is just still missing: >> >> commit fcc926bb857949dbfa51a7d95f3f5ebc657f198c >> Author: Jens Axboe<axboe@xxxxxxxxx> >> Date: Fri Jan 27 09:28:13 2023 -0700 >> >> io_uring: add a conditional reschedule to the IOPOLL cancelation loop >> >> and I'm guessing you're running without preempt. > With 6.2.0-rc8+, I had a different crash running poll-race-mshot.t: > > Backtrace: > > > Kernel Fault: Code=15 (Data TLB miss fault) at addr 0000000000000000 > CPU: 0 PID: 18265 Comm: poll-race-mshot Not tainted 6.2.0-rc8+ #1 > Hardware name: 9000/800/rp3440 > > YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI > PSW: 00010000001001001001000111110000 Not tainted > r00-03 00000000102491f0 ffffffffffffffff 000000004020307c ffffffffffffffff > r04-07 ffffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffff > r08-11 ffffffffffffffff 000000000407ef28 000000000407f838 8400000000800000 > r12-15 0000000000000000 0000000040c424e0 0000000040c424e0 0000000040c424e0 > r16-19 000000000407fd68 0000000063f08648 0000000040c424e0 000000000a085000 > r20-23 00000000000d6b44 000000002faf0800 00000000000000ff 0000000000000002 > r24-27 000000000407fa30 000000000407fd68 0000000000000000 0000000040c1e4e0 > r28-31 400000000000de84 0000000000000000 0000000000000000 0000000000000002 > sr00-03 0000000004081000 0000000000000000 0000000000000000 0000000004081de0 > sr04-07 0000000004081000 0000000000000000 0000000000000000 00000000040815a8 > > IASQ: 0000000004081000 0000000000000000 IAOQ: 0000000000000000 0000000004081590 > IIR: 00000000 ISR: 0000000000000000 IOR: 0000000000000000 > CPU: 0 CR30: 000000004daf5700 CR31: ffffffffffffefff > ORIG_R28: 0000000000000000 > IAOQ[0]: 0x0 > IAOQ[1]: linear_quiesce+0x0/0x18 [linear] > RP(r2): intr_check_sig+0x0/0x3c > Backtrace: > > Kernel panic - not syncing: Kernel Fault This means very little to me, is it a NULL pointer deref? And where's the backtrace? -- Jens Axboe
