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McKenney wrote: > On Wed, May 14, 2025 at 10:47:30AM +0800, kernel test robot wrote: > > > > hi, Paul, > > > > for this commit we tested before, now we found it causes issues in linux-next > > master branch. > > Good catch as always!!! Yes, using HRTIMER_MODE_HARD means that this > ircutorture_one_extend_check() function must check for hardirq as well > as softirq. Which, oddly enough, permits simplifying the code, though > a larger patch. > > I could reproduce this, and the patch at the end of this email fixes it > for me. Does it work for you as well? thanks a lot for information! what's the base of the patch? I tried to apply it upon c27d0d38f2 or lastest linux-next/master bdd609656ff55 (tag: next-20250514, linux-next/master) Add linux-next specific files for 20250514 both failed. thanks > > Thanx, Paul > > > ========================================================================================= > > tbox_group/testcase/rootfs/kconfig/compiler/runtime/test/torture_type: > > vm-snb/rcutorture/debian-11.1-i386-20220923.cgz/i386-randconfig-141-20250508/clang-20/300s/cpuhotplug/srcud > > > > c795676b5c0a4ab7 c27d0d38f2cafb70a68ca42c410 > > ---------------- --------------------------- > > fail:runs %reproduction fail:runs > > | | | > > :50 2% 1:50 dmesg.EIP:__kernel_text_address > > :50 4% 2:50 dmesg.EIP:__srcu_check_read_flavor > > :50 2% 1:50 dmesg.EIP:_raw_spin_unlock_irq > > :50 14% 7:50 dmesg.EIP:_raw_spin_unlock_irqrestore > > :50 30% 15:50 dmesg.EIP:console_flush_all > > :50 4% 2:50 dmesg.EIP:console_trylock_spinning > > :50 2% 1:50 dmesg.EIP:delay_tsc > > :50 2% 1:50 dmesg.EIP:finish_lock_switch > > :50 2% 1:50 dmesg.EIP:kernel_text_address > > :50 2% 1:50 dmesg.EIP:lock_acquire > > :50 36% 18:50 dmesg.EIP:pv_native_safe_halt > > 1:50 -2% :50 dmesg.EIP:rcu_torture_fwd_prog_cr > > 7:50 -14% :50 dmesg.EIP:rcu_torture_writer > > :50 100% 50:50 dmesg.EIP:rcutorture_one_extend_check > > 48:50 0% 48:50 dmesg.INFO:task_blocked_for_more_than#seconds > > 48:50 0% 48:50 dmesg.Kernel_panic-not_syncing:hung_task:blocked_tasks > > 50:50 0% 50:50 dmesg.UBSAN:negation-overflow_in_lib/sort.c > > 1:50 -2% :50 dmesg.WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_fwd_prog_cr[rcutorture] > > 7:50 -14% :50 dmesg.WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_writer[rcutorture] > > :50 100% 50:50 dmesg.WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture] <--- (1) > > 7:50 -14% :50 dmesg.calltrace:__do_softirq > > 1:50 -2% :50 dmesg.calltrace:rcu_torture_pipe_update > > > > though both c27d0d38f2/parent have various issues, it seems (1) is persistent > > on c27d0d38f2 and clean on parent. > > > > > > Hello, > > > > kernel test robot noticed "WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]" on: > > > > commit: c27d0d38f2cafb70a68ca42c4105e170862aaf77 ("rcutorture: Complain if an ->up_read() is delayed more than 10 seconds") > > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > > > > [test failed on linux-next/master f48887a98b78880b7711aca311fbbbcaad6c4e3b] > > > > in testcase: rcutorture > > version: > > with following parameters: > > > > runtime: 300s > > test: cpuhotplug > > torture_type: srcud > > > > > > > > config: i386-randconfig-141-20250508 > > compiler: clang-20 > > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > > > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > the same patch/commit), kindly add following tags > > | Reported-by: kernel test robot > > | Closes: https://lore.kernel.org/oe-lkp/202505140917.8ee62cc6-lkp@intel.com > > > > > > The kernel config and materials to reproduce are available at: > > https://download.01.org/0day-ci/archive/20250514/202505140917.8ee62cc6-lkp@intel.com > > > > > > [ 76.027193][ C1] ------------[ cut here ]------------ > > [ 76.027652][ T661] srcud-torture: rcu_torture_stats task started > > [ 76.027754][ C1] rcutorture_one_extend_check before change: Current 0x80 To add 0x0 To remove 0x80 preempt_count() 0x10001 > > [ 76.029893][ C1] WARNING: CPU: 1 PID: 2 at kernel/rcu/rcutorture.c:1976 rcutorture_one_extend_check+0x5b/0x300 [rcutorture] > > [ 76.031093][ C1] Modules linked in: rcutorture(+) torture > > [ 76.031736][ C1] CPU: 1 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.15.0-rc1-00008-gc27d0d38f2ca #1 PREEMPT(full) 4c3e2c742772c0895467dcaa42b0aab115cc2926 > > [ 76.033194][ C1] Tainted: [T]=RANDSTRUCT > > [ 76.033728][ C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > > [ 76.034602][ C1] EIP: rcutorture_one_extend_check+0x5b/0x300 [rcutorture] > > [ 76.035319][ C1] Code: 05 68 e2 69 f0 01 64 a1 0c f0 b4 c3 25 ff ff ff 7f 50 ff 75 0c 57 53 56 68 e3 c9 6a f0 68 19 b5 6a f0 e8 b8 c8 96 d0 83 c4 1c <0f> 0b f6 c3 09 75 1d eb 35 9c 8f 45 ec f7 45 ec 00 02 00 00 74 09 > > [ 76.037024][ C1] EAX: 0000006c EBX: 00000080 ECX: 00000027 EDX: 00000000 > > [ 76.037760][ C1] ESI: f06ad951 EDI: 00000000 EBP: c7f19da0 ESP: c7f19d8c > > [ 76.038490][ C1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010082 > > [ 76.039252][ C1] CR0: 80050033 CR2: b7e17eb0 CR3: 08be7000 CR4: 00040690 > > [ 76.039989][ C1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > > [ 76.040713][ C1] DR6: fffe0ff0 DR7: 00000400 > > [ 76.041313][ C1] Call Trace: > > [ 76.041825][ C1] rcutorture_one_extend+0x54/0x4b0 [rcutorture 4a4a34e515cdd0c53b2c18de8a71945278e82895] > > [ 76.042705][ C1] ? lock_acquire+0xa8/0x1c0 > > [ 76.043299][ C1] rcu_torture_one_read_end+0x1b7/0x350 [rcutorture 4a4a34e515cdd0c53b2c18de8a71945278e82895] > > [ 76.044196][ C1] ? local_bh_enable+0x20/0x20 [rcutorture 4a4a34e515cdd0c53b2c18de8a71945278e82895] > > [ 76.045049][ C1] rcu_torture_updown_hrt+0x18/0x30 [rcutorture 4a4a34e515cdd0c53b2c18de8a71945278e82895] > > [ 76.045935][ C1] __hrtimer_run_queues+0x18a/0x3b0 > > [ 76.046555][ C1] ? ktime_get_update_offsets_now+0x52/0x200 > > [ 76.047309][ C1] hrtimer_run_queues+0xf7/0x130 > > [ 76.048063][ C1] update_process_times+0x25/0xb0 > > [ 76.048680][ C1] tick_periodic+0xc4/0xe0 > > [ 76.049272][ C1] tick_handle_periodic+0x23/0x70 > > [ 76.049875][ C1] __sysvec_apic_timer_interrupt+0x73/0x190 > > [ 76.050528][ C1] ? sysvec_call_function_single+0x30/0x30 > > [ 76.051175][ C1] sysvec_apic_timer_interrupt+0x1a/0x34 > > [ 76.051812][ C1] handle_exception+0x150/0x150 > > [ 76.052405][ C1] EIP: lock_acquire+0xda/0x1c0 > > [ 76.052998][ C1] Code: 64 0f c1 05 8c 0e b5 c3 83 f8 01 0f 85 a5 00 00 00 9c 8f 45 d4 f7 45 d4 00 02 00 00 0f 85 a6 00 00 00 85 f6 74 01 fb 83 c4 20 <5e> 5f 5b 5d 2e e9 30 3d 3c 01 89 ce 89 55 f0 8b 55 f0 ff 75 14 ff > > [ 76.054753][ C1] EAX: 00000001 EBX: c345d894 ECX: b4a771ac EDX: 00000000 > > [ 76.055499][ C1] ESI: 00000001 EDI: 00000000 EBP: c7f19f50 ESP: c7f19f44 > > [ 76.056248][ C1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00000286 > > [ 76.057032][ C1] ? try_to_wake_up+0x248/0x850 > > [ 76.057690][ C1] ? sysvec_call_function_single+0x30/0x30 > > [ 76.058377][ C1] ? try_to_wake_up+0x248/0x850 > > [ 76.059009][ C1] ? sysvec_call_function_single+0x30/0x30 > > [ 76.059693][ C1] ? lock_acquire+0xda/0x1c0 > > [ 76.060312][ C1] _raw_spin_lock+0x2a/0x3c > > [ 76.060927][ C1] ? kthreadd+0xda/0x160 > > [ 76.061549][ C1] kthreadd+0xda/0x160 > > [ 76.062126][ C1] ? schedule_tail+0xd4/0x120 > > [ 76.062729][ C1] ? kthread_stop_put+0x30/0x30 > > [ 76.063335][ C1] ? kthread_stop_put+0x30/0x30 > > [ 76.063933][ C1] ret_from_fork+0x35/0x40 > > [ 76.064505][ C1] ret_from_fork_asm+0x12/0x1c > > [ 76.065091][ C1] entry_INT80_32+0x10d/0x10d > > [ 76.065693][ C1] irq event stamp: 4386 > > [ 76.066236][ C1] hardirqs last enabled at (4385): [] finish_lock_switch+0x9d/0xe0 > > [ 76.067037][ C1] hardirqs last disabled at (4386): [] sysvec_apic_timer_interrupt+0xc/0x34 > > [ 76.067873][ C1] softirqs last enabled at (2260): [] handle_softirqs+0x372/0x3b0 > > [ 76.068659][ C1] softirqs last disabled at (2255): [] __do_softirq+0xf/0x16 > > [ 76.069635][ C1] ---[ end trace 0000000000000000 ]--- > > [ 76.099825][ T636] srcud-torture: Creating torture_stutter task > > [ 76.099831][ T667] srcud-torture: torture_shuffle task started > > [ 76.101418][ T636] srcud-torture: Creating torture_onoff task > > > > > > -- > > 0-DAY CI Kernel Test Service > > https://github.com/intel/lkp-tests/wiki > > ------------------------------------------------------------------------ > > diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c > index 373c65a6e1031..0840153c90d18 100644 > --- a/kernel/rcu/rcutorture.c > +++ b/kernel/rcu/rcutorture.c > @@ -1975,14 +1975,14 @@ static void rcu_torture_reader_do_mbchk(long myid, struct rcu_torture *rtp, > > // Verify the specified RCUTORTURE_RDR* state. > #define ROEC_ARGS "%s %s: Current %#x To add %#x To remove %#x preempt_count() %#x\n", __func__, s, curstate, new, old, preempt_count() > -static void rcutorture_one_extend_check(char *s, int curstate, int new, int old, bool insoftirq) > +static void rcutorture_one_extend_check(char *s, int curstate, int new, int old) > { > int mask; > > - if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE)) > + if (!IS_ENABLED(CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE) || in_nmi()) > return; > > - WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled(), ROEC_ARGS); > + WARN_ONCE(!(curstate & RCUTORTURE_RDR_IRQ) && irqs_disabled() && !in_hardirq(), ROEC_ARGS); > WARN_ONCE((curstate & RCUTORTURE_RDR_IRQ) && !irqs_disabled(), ROEC_ARGS); > > // If CONFIG_PREEMPT_COUNT=n, further checks are unreliable. > @@ -1997,9 +1997,9 @@ static void rcutorture_one_extend_check(char *s, int curstate, int new, int old, > (curstate & (RCUTORTURE_RDR_RCU_1 | RCUTORTURE_RDR_RCU_2)) && > cur_ops->readlock_nesting() == 0, ROEC_ARGS); > > - // Timer handlers have all sorts of stuff disabled, so ignore > + // Interrupt handlers have all sorts of stuff disabled, so ignore > // unintended disabling. > - if (insoftirq) > + if (in_serving_softirq() || in_hardirq()) > return; > > WARN_ONCE(cur_ops->extendables && > @@ -2038,8 +2038,7 @@ static void rcutorture_one_extend_check(char *s, int curstate, int new, int old, > * beginning or end of the critical section and if there was actually a > * change, do a ->read_delay(). > */ > -static void rcutorture_one_extend(int *readstate, int newstate, bool insoftirq, > - struct torture_random_state *trsp, > +static void rcutorture_one_extend(int *readstate, int newstate, struct torture_random_state *trsp, > struct rt_read_seg *rtrsp) > { > bool first; > @@ -2054,7 +2053,7 @@ static void rcutorture_one_extend(int *readstate, int newstate, bool insoftirq, > first = idxold1 == 0; > WARN_ON_ONCE(idxold2 < 0); > WARN_ON_ONCE(idxold2 & ~(RCUTORTURE_RDR_ALLBITS | RCUTORTURE_RDR_UPDOWN)); > - rcutorture_one_extend_check("before change", idxold1, statesnew, statesold, insoftirq); > + rcutorture_one_extend_check("before change", idxold1, statesnew, statesold); > rtrsp->rt_readstate = newstate; > > /* First, put new protection in place to avoid critical-section gap. */ > @@ -2074,8 +2073,7 @@ static void rcutorture_one_extend(int *readstate, int newstate, bool insoftirq, > idxnew2 = (cur_ops->readlock() << RCUTORTURE_RDR_SHIFT_2) & RCUTORTURE_RDR_MASK_2; > > // Complain unless both the old and the new protection is in place. > - rcutorture_one_extend_check("during change", > - idxold1 | statesnew, statesnew, statesold, insoftirq); > + rcutorture_one_extend_check("during change", idxold1 | statesnew, statesnew, statesold); > > // Sample CPU under both sets of protections to reduce confusion. > if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)) { > @@ -2150,7 +2148,7 @@ static void rcutorture_one_extend(int *readstate, int newstate, bool insoftirq, > WARN_ON_ONCE(*readstate < 0); > if (WARN_ON_ONCE(*readstate & ~RCUTORTURE_RDR_ALLBITS)) > pr_info("Unexpected readstate value of %#x\n", *readstate); > - rcutorture_one_extend_check("after change", *readstate, statesnew, statesold, insoftirq); > + rcutorture_one_extend_check("after change", *readstate, statesnew, statesold); > } > > /* Return the biggest extendables mask given current RCU and boot parameters. */ > @@ -2217,8 +2215,7 @@ rcutorture_extend_mask(int oldmask, struct torture_random_state *trsp) > * critical section. > */ > static struct rt_read_seg * > -rcutorture_loop_extend(int *readstate, bool insoftirq, struct torture_random_state *trsp, > - struct rt_read_seg *rtrsp) > +rcutorture_loop_extend(int *readstate, struct torture_random_state *trsp, struct rt_read_seg *rtrsp) > { > int i; > int j; > @@ -2233,7 +2230,7 @@ rcutorture_loop_extend(int *readstate, bool insoftirq, struct torture_random_sta > for (j = 0; j < i; j++) { > mask = rcutorture_extend_mask(*readstate, trsp); > WARN_ON_ONCE(mask & RCUTORTURE_RDR_UPDOWN); > - rcutorture_one_extend(readstate, mask, insoftirq, trsp, &rtrsp[j]); > + rcutorture_one_extend(readstate, mask, trsp, &rtrsp[j]); > } > return &rtrsp[j]; > } > @@ -2279,7 +2276,7 @@ static bool rcu_torture_one_read_start(struct rcu_torture_one_read_state *rtorsp > (rtorsp->readstate & RCUTORTURE_RDR_UPDOWN)); > if (rtorsp->p == NULL) { > /* Wait for rcu_torture_writer to get underway */ > - rcutorture_one_extend(&rtorsp->readstate, 0, myid < 0, trsp, rtorsp->rtrsp); > + rcutorture_one_extend(&rtorsp->readstate, 0, trsp, rtorsp->rtrsp); > return false; > } > if (rtorsp->p->rtort_mbtest == 0) > @@ -2293,7 +2290,7 @@ static bool rcu_torture_one_read_start(struct rcu_torture_one_read_state *rtorsp > * critical sections and check for errors. > */ > static void rcu_torture_one_read_end(struct rcu_torture_one_read_state *rtorsp, > - struct torture_random_state *trsp, long myid) > + struct torture_random_state *trsp) > { > int i; > unsigned long completed; > @@ -2340,7 +2337,7 @@ static void rcu_torture_one_read_end(struct rcu_torture_one_read_state *rtorsp, > } > if (cur_ops->reader_blocked) > preempted = cur_ops->reader_blocked(); > - rcutorture_one_extend(&rtorsp->readstate, 0, myid < 0, trsp, rtorsp->rtrsp); > + rcutorture_one_extend(&rtorsp->readstate, 0, trsp, rtorsp->rtrsp); > WARN_ON_ONCE(rtorsp->readstate); > // This next splat is expected behavior if leakpointer, especially > // for CONFIG_RCU_STRICT_GRACE_PERIOD=y kernels. > @@ -2370,13 +2367,13 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp, long myid) > init_rcu_torture_one_read_state(&rtors, trsp); > newstate = rcutorture_extend_mask(rtors.readstate, trsp); > WARN_ON_ONCE(newstate & RCUTORTURE_RDR_UPDOWN); > - rcutorture_one_extend(&rtors.readstate, newstate, myid < 0, trsp, rtors.rtrsp++); > + rcutorture_one_extend(&rtors.readstate, newstate, trsp, rtors.rtrsp++); > if (!rcu_torture_one_read_start(&rtors, trsp, myid)) { > - rcutorture_one_extend(&rtors.readstate, 0, myid < 0, trsp, rtors.rtrsp); > + rcutorture_one_extend(&rtors.readstate, 0, trsp, rtors.rtrsp); > return false; > } > - rtors.rtrsp = rcutorture_loop_extend(&rtors.readstate, myid < 0, trsp, rtors.rtrsp); > - rcu_torture_one_read_end(&rtors, trsp, myid); > + rtors.rtrsp = rcutorture_loop_extend(&rtors.readstate, trsp, rtors.rtrsp); > + rcu_torture_one_read_end(&rtors, trsp); > return true; > } > > @@ -2469,7 +2466,7 @@ static enum hrtimer_restart rcu_torture_updown_hrt(struct hrtimer *hrtp) > struct rcu_torture_one_read_state_updown *rtorsup; > > rtorsup = container_of(hrtp, struct rcu_torture_one_read_state_updown, rtorsu_hrt); > - rcu_torture_one_read_end(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs, -1); > + rcu_torture_one_read_end(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs); > WARN_ONCE(rtorsup->rtorsu_nups >= rtorsup->rtorsu_ndowns, "%s: Up without matching down #%zu.\n", __func__, rtorsup - updownreaders); > WRITE_ONCE(rtorsup->rtorsu_nups, rtorsup->rtorsu_nups + 1); > WRITE_ONCE(rtorsup->rtorsu_nmigrates, > @@ -2519,7 +2516,7 @@ static void rcu_torture_updown_cleanup(void) > if (!smp_load_acquire(&rtorsup->rtorsu_inuse)) > continue; > if (hrtimer_cancel(&rtorsup->rtorsu_hrt) || WARN_ON_ONCE(rtorsup->rtorsu_inuse)) { > - rcu_torture_one_read_end(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs, -1); > + rcu_torture_one_read_end(&rtorsup->rtorsu_rtors, &rtorsup->rtorsu_trs); > WARN_ONCE(rtorsup->rtorsu_nups >= rtorsup->rtorsu_ndowns, "%s: Up without matching down #%zu.\n", __func__, rtorsup - updownreaders); > WRITE_ONCE(rtorsup->rtorsu_nups, rtorsup->rtorsu_nups + 1); > smp_store_release(&rtorsup->rtorsu_inuse, false);