On Mon, 30 Oct 2023, Marek Marczykowski-Górecki wrote: > On Mon, Oct 30, 2023 at 04:56:03PM +0100, Jan Kara wrote: > > On Mon 30-10-23 15:08:56, Mikulas Patocka wrote: > > > On Mon, 30 Oct 2023, Marek Marczykowski-Górecki wrote: > > > > > > > > Well, it would be possible that larger pages in a bio would trip e.g. bio > > > > > splitting due to maximum segment size the disk supports (which can be e.g. > > > > > 0xffff) and that upsets something somewhere. But this is pure > > > > > speculation. We definitely need more debug data to be able to tell more. > > > > > > > > I can collect more info, but I need some guidance how :) Some patch > > > > adding extra debug messages? > > > > Note I collect those via serial console (writing to disk doesn't work > > > > when it freezes), and that has some limits in the amount of data I can > > > > extract especially when printed quickly. For example sysrq-t is too much. > > > > Or maybe there is some trick to it, like increasing log_bug_len? > > > > > > If you can do more tests, I would suggest this: > > > > > > We already know that it works with order 3 and doesn't work with order 4. > > > > > > So, in the file include/linux/mmzone.h, change PAGE_ALLOC_COSTLY_ORDER > > > from 3 to 4 and in the file drivers/md/dm-crypt.c leave "unsigned int > > > order = PAGE_ALLOC_COSTLY_ORDER" there. > > > > > > Does it deadlock or not? > > > > > > So, that we can see whether the deadlock depends on > > > PAGE_ALLOC_COSTLY_ORDER or whether it is just a coincidence. > > > > Good idea. Also if the kernel hangs, please find kcryptd processes. In what > > state are they? If they are sleeping, please send what's in > > /proc/<kcryptd-pid>/stack. Thanks! > > Will do. > > In the meantime, while testing version with PAGE_ALLOC_COSTLY_ORDER=4, > and order=PAGE_ALLOC_COSTLY_ORDER, I'm getting crash like this (see > important note below both traces): Perhaps the kernel uses a hardcoded value "3" instead of PAGE_ALLOC_COSTLY_ORDER somewhere... > [ 92.668486] BUG: unable to handle page fault for address: ffff8880c7b64098 > [ 92.668558] #PF: supervisor read access in kernel mode > [ 92.668574] #PF: error_code(0x0000) - not-present page > [ 92.668590] PGD 2a32067 P4D 2a32067 PUD 12868a067 PMD 0 > [ 92.668617] Oops: 0000 [#1] PREEMPT SMP NOPTI > [ 92.668637] CPU: 5 PID: 0 Comm: swapper/5 Tainted: G W 6.5.6-dirty #354 > [ 92.668658] Hardware name: Star Labs StarBook/StarBook, BIOS 8.97 10/03/2023 > [ 92.668675] RIP: e030:__free_one_page+0x301/0x3e0 > [ 92.668704] Code: 02 0f 85 c1 fe ff ff 49 c1 e6 04 49 8d 4c 24 08 4a 8d 94 36 c0 00 00 00 48 8d 34 80 48 8d 04 70 4c 01 fa 48 c1 e0 03 49 01 c6 <4b> 8b b4 37 c0 00 00 00 48 89 4e 08 49 89 74 24 08 49 89 54 24 10 > [ 92.668738] RSP: e02b:ffffc90040154c60 EFLAGS: 00010006 > [ 92.668754] RAX: 0000000000000058 RBX: 0000000000000001 RCX: ffff888075f66bc0 > [ 92.668773] RDX: ffff8880c7b64098 RSI: 0000000000000005 RDI: 0000000000000000 > [ 92.668789] RBP: fffffe7a01d7d9ae R08: ffff888075f66b38 R09: fffffe7a01d7d9ac > [ 92.668805] R10: ffffea0004b35bc8 R11: 0000000000000001 R12: ffff888075f66bb8 > [ 92.668821] R13: 0000000000000000 R14: 0000000051bfd4d8 R15: ffff888075f66b00 > [ 92.668854] FS: 0000000000000000(0000) GS:ffff888189740000(0000) knlGS:0000000000000000 > [ 92.668874] CS: 10000e030 DS: 002b ES: 002b CR0: 0000000080050033 > [ 92.668889] CR2: ffff8880c7b64098 CR3: 0000000133cf8000 CR4: 0000000000050660 > [ 92.668912] Call Trace: > [ 92.668924] <IRQ> > [ 92.668934] ? __die+0x1e/0x60 > [ 92.668955] ? page_fault_oops+0x178/0x4a0 > [ 92.668975] ? exc_page_fault+0x14e/0x160 > [ 92.668994] ? asm_exc_page_fault+0x26/0x30 > [ 92.669014] ? __free_one_page+0x301/0x3e0 > [ 92.669027] free_pcppages_bulk+0x11c/0x2b0 > [ 92.669042] free_unref_page+0x10d/0x170 > [ 92.669058] crypt_free_buffer_pages+0x1f4/0x250 > [ 92.669079] crypt_endio+0x48/0x70 > [ 92.669094] blk_mq_end_request_batch+0xd0/0x400 > [ 92.669114] nvme_irq+0x6d/0x80 > [ 92.669132] ? __pfx_nvme_pci_complete_batch+0x10/0x10 > [ 92.669148] __handle_irq_event_percpu+0x42/0x1a0 > [ 92.669166] handle_irq_event+0x33/0x70 > [ 92.669179] handle_edge_irq+0x9e/0x240 > [ 92.669197] handle_irq_desc+0x36/0x50 > [ 92.669215] __evtchn_fifo_handle_events+0x1af/0x1d0 > [ 92.669236] __xen_evtchn_do_upcall+0x70/0xd0 > [ 92.669255] __xen_pv_evtchn_do_upcall+0x3d/0x70 > [ 92.669275] xen_pv_evtchn_do_upcall+0xd9/0x110 > [ 92.669294] </IRQ> > [ 92.669302] <TASK> > [ 92.669310] exc_xen_hypervisor_callback+0x8/0x20 > [ 92.669330] RIP: e030:xen_hypercall_xen_version+0xa/0x20 > [ 92.669348] Code: 51 41 53 b8 10 00 00 00 0f 05 41 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 51 41 53 b8 11 00 00 00 0f 05 <41> 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc > [ 92.669380] RSP: e02b:ffffc900400c7e08 EFLAGS: 00000246 > [ 92.669394] RAX: 0000000000040011 RBX: 0000000000000000 RCX: ffffffff81fc222a > [ 92.669411] RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 > [ 92.669426] RBP: ffffc900400c7eb0 R08: 0000000000000000 R09: 00000000000001ba > [ 92.669442] R10: 0000000000007ff0 R11: 0000000000000246 R12: ffff88818976c540 > [ 92.669458] R13: ffff888101e10000 R14: 0000000000000000 R15: 0000000000000402 > [ 92.669475] ? xen_hypercall_xen_version+0xa/0x20 > [ 92.669493] ? pmu_msr_read+0x3c/0xd0 > [ 92.669510] ? xen_force_evtchn_callback+0xd/0x20 > [ 92.669526] ? check_events+0x16/0x30 > [ 92.669540] ? xen_irq_enable_direct+0x1d/0x30 > [ 92.669556] ? finish_task_switch.isra.0+0x8e/0x270 > [ 92.669576] ? __switch_to+0x165/0x3b0 > [ 92.669590] ? __schedule+0x316/0x8b0 > [ 92.669609] ? schedule_idle+0x25/0x40 > [ 92.669626] ? cpu_startup_entry+0x25/0x30 > [ 92.669641] ? cpu_bringup_and_idle+0x89/0xa0 > [ 92.669660] ? asm_cpu_bringup_and_idle+0x9/0x10 > [ 92.669680] </TASK> > [ 92.669688] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_generic ledtrig_audio snd_sof_pci_intel_tgl snd_sof_intel_hda_common snd_soc_hdac_hda soundwire_intel soundwire_generic_allocation snd_sof_intel_hda_mlink soundwire_cadence snd_sof_intel_hda snd_sof_pci snd_sof snd_sof_utils snd_sof_xtensa_dsp snd_soc_acpi_intel_match snd_soc_acpi snd_hda_ext_core soundwire_bus snd_soc_core snd_compress snd_pcm_dmaengine ac97_bus snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hwdep hid_multitouch snd_hda_core snd_seq snd_seq_device idma64 snd_pcm i2c_designware_platform iwlwifi i2c_designware_core snd_timer snd soundcore i2c_i801 i2c_smbus efivarfs i2c_hid_acpi i2c_hid pinctrl_tigerlake pinctrl_intel xen_acpi_processor xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput > [ 92.669901] CR2: ffff8880c7b64098 > [ 92.669915] ---[ end trace 0000000000000000 ]--- > [ 92.669930] RIP: e030:__free_one_page+0x301/0x3e0 > [ 92.669946] Code: 02 0f 85 c1 fe ff ff 49 c1 e6 04 49 8d 4c 24 08 4a 8d 94 36 c0 00 00 00 48 8d 34 80 48 8d 04 70 4c 01 fa 48 c1 e0 03 49 01 c6 <4b> 8b b4 37 c0 00 00 00 48 89 4e 08 49 89 74 24 08 49 89 54 24 10 > [ 92.669977] RSP: e02b:ffffc90040154c60 EFLAGS: 00010006 > [ 92.669992] RAX: 0000000000000058 RBX: 0000000000000001 RCX: ffff888075f66bc0 > [ 92.670008] RDX: ffff8880c7b64098 RSI: 0000000000000005 RDI: 0000000000000000 > [ 92.670024] RBP: fffffe7a01d7d9ae R08: ffff888075f66b38 R09: fffffe7a01d7d9ac > [ 92.670040] R10: ffffea0004b35bc8 R11: 0000000000000001 R12: ffff888075f66bb8 > [ 92.670055] R13: 0000000000000000 R14: 0000000051bfd4d8 R15: ffff888075f66b00 > [ 92.670083] FS: 0000000000000000(0000) GS:ffff888189740000(0000) knlGS:0000000000000000 > [ 92.670101] CS: 10000e030 DS: 002b ES: 002b CR0: 0000000080050033 > [ 92.670116] CR2: ffff8880c7b64098 CR3: 0000000133cf8000 CR4: 0000000000050660 > [ 92.670148] Kernel panic - not syncing: Fatal exception in interrupt > [ 92.670177] ------------[ cut here ]------------ > [ 92.670188] WARNING: CPU: 5 PID: 0 at kernel/smp.c:766 smp_call_function_many_cond+0x4db/0x560 > [ 92.670219] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_generic ledtrig_audio snd_sof_pci_intel_tgl snd_sof_intel_hda_common snd_soc_hdac_hda soundwire_intel soundwire_generic_allocation snd_sof_intel_hda_mlink soundwire_cadence snd_sof_intel_hda snd_sof_pci snd_sof snd_sof_utils snd_sof_xtensa_dsp snd_soc_acpi_intel_match snd_soc_acpi snd_hda_ext_core soundwire_bus snd_soc_core snd_compress snd_pcm_dmaengine ac97_bus snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hwdep hid_multitouch snd_hda_core snd_seq snd_seq_device idma64 snd_pcm i2c_designware_platform iwlwifi i2c_designware_core snd_timer snd soundcore i2c_i801 i2c_smbus efivarfs i2c_hid_acpi i2c_hid pinctrl_tigerlake pinctrl_intel xen_acpi_processor xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput > [ 92.670400] CPU: 5 PID: 0 Comm: swapper/5 Tainted: G D W 6.5.6-dirty #354 > [ 92.670419] Hardware name: Star Labs StarBook/StarBook, BIOS 8.97 10/03/2023 > [ 92.670434] RIP: e030:smp_call_function_many_cond+0x4db/0x560 > [ 92.670455] Code: f0 52 1b 81 48 89 74 24 08 e8 d1 c8 f6 ff 48 8b 74 24 08 65 ff 0d 5d 70 e7 7e 0f 85 bb fd ff ff 0f 1f 44 00 00 e9 b1 fd ff ff <0f> 0b e9 69 fb ff ff 8b 7c 24 38 e8 d5 4f f7 ff 84 c0 0f 84 a8 fd > [ 92.670486] RSP: e02b:ffffc900401549d0 EFLAGS: 00010006 > [ 92.670500] RAX: 0000000080010007 RBX: 0000000000000000 RCX: 0000000000000000 > [ 92.670516] RDX: 0000000000000000 RSI: ffffffff826f3c61 RDI: ffffffff82cbc1d0 > [ 92.670531] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000001 > [ 92.670546] R10: 00000000ffffdfff R11: ffffffff82a5ddc0 R12: 0000000000000005 > [ 92.670562] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > [ 92.670588] FS: 0000000000000000(0000) GS:ffff888189740000(0000) knlGS:0000000000000000 > [ 92.670606] CS: 10000e030 DS: 002b ES: 002b CR0: 0000000080050033 > [ 92.670620] CR2: ffff8880c7b64098 CR3: 0000000133cf8000 CR4: 0000000000050660 > [ 92.670642] Call Trace: > [ 92.670650] <IRQ> > [ 92.670659] ? smp_call_function_many_cond+0x4db/0x560 > [ 92.670677] ? __warn+0x7c/0x130 > [ 92.670693] ? smp_call_function_many_cond+0x4db/0x560 > [ 92.670711] ? report_bug+0x191/0x1c0 > [ 92.670726] ? handle_bug+0x3c/0x80 > [ 92.670742] ? exc_invalid_op+0x17/0x70 > [ 92.670758] ? asm_exc_invalid_op+0x1a/0x20 > [ 92.670775] ? smp_call_function_many_cond+0x4db/0x560 > [ 92.670793] ? __pfx_stop_self+0x10/0x10 > [ 92.670811] ? _printk+0x5f/0x80 > [ 92.670823] ? __pfx_stop_self+0x10/0x10 > [ 92.670840] smp_call_function+0x38/0x70 > [ 92.670857] panic+0x19c/0x320 > [ 92.670873] oops_end+0xd8/0xe0 > [ 92.670887] page_fault_oops+0x19c/0x4a0 > [ 92.670905] exc_page_fault+0x14e/0x160 > [ 92.670921] asm_exc_page_fault+0x26/0x30 > [ 92.670937] RIP: e030:__free_one_page+0x301/0x3e0 > [ 92.670952] Code: 02 0f 85 c1 fe ff ff 49 c1 e6 04 49 8d 4c 24 08 4a 8d 94 36 c0 00 00 00 48 8d 34 80 48 8d 04 70 4c 01 fa 48 c1 e0 03 49 01 c6 <4b> 8b b4 37 c0 00 00 00 48 89 4e 08 49 89 74 24 08 49 89 54 24 10 > [ 92.670983] RSP: e02b:ffffc90040154c60 EFLAGS: 00010006 > [ 92.670997] RAX: 0000000000000058 RBX: 0000000000000001 RCX: ffff888075f66bc0 > [ 92.671013] RDX: ffff8880c7b64098 RSI: 0000000000000005 RDI: 0000000000000000 > [ 92.671028] RBP: fffffe7a01d7d9ae R08: ffff888075f66b38 R09: fffffe7a01d7d9ac > [ 92.671044] R10: ffffea0004b35bc8 R11: 0000000000000001 R12: ffff888075f66bb8 > [ 92.671059] R13: 0000000000000000 R14: 0000000051bfd4d8 R15: ffff888075f66b00 > [ 92.671077] free_pcppages_bulk+0x11c/0x2b0 > [ 92.671091] free_unref_page+0x10d/0x170 > [ 92.671106] crypt_free_buffer_pages+0x1f4/0x250 > [ 92.671122] crypt_endio+0x48/0x70 > [ 92.671136] blk_mq_end_request_batch+0xd0/0x400 > [ 92.671152] nvme_irq+0x6d/0x80 > [ 92.671166] ? __pfx_nvme_pci_complete_batch+0x10/0x10 > [ 92.671181] __handle_irq_event_percpu+0x42/0x1a0 > [ 92.671196] handle_irq_event+0x33/0x70 > [ 92.671208] handle_edge_irq+0x9e/0x240 > [ 92.671224] handle_irq_desc+0x36/0x50 > [ 92.671241] __evtchn_fifo_handle_events+0x1af/0x1d0 > [ 92.671258] __xen_evtchn_do_upcall+0x70/0xd0 > [ 92.671275] __xen_pv_evtchn_do_upcall+0x3d/0x70 > [ 92.671292] xen_pv_evtchn_do_upcall+0xd9/0x110 > [ 92.671308] </IRQ> > [ 92.671316] <TASK> > [ 92.671324] exc_xen_hypervisor_callback+0x8/0x20 > [ 92.671342] RIP: e030:xen_hypercall_xen_version+0xa/0x20 > [ 92.671360] Code: 51 41 53 b8 10 00 00 00 0f 05 41 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 51 41 53 b8 11 00 00 00 0f 05 <41> 5b 59 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc > [ 92.671390] RSP: e02b:ffffc900400c7e08 EFLAGS: 00000246 > [ 92.671403] RAX: 0000000000040011 RBX: 0000000000000000 RCX: ffffffff81fc222a > [ 92.671419] RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 > [ 92.671434] RBP: ffffc900400c7eb0 R08: 0000000000000000 R09: 00000000000001ba > [ 92.671449] R10: 0000000000007ff0 R11: 0000000000000246 R12: ffff88818976c540 > [ 92.671465] R13: ffff888101e10000 R14: 0000000000000000 R15: 0000000000000402 > [ 92.671481] ? xen_hypercall_xen_version+0xa/0x20 > [ 92.671499] ? pmu_msr_read+0x3c/0xd0 > [ 92.671514] ? xen_force_evtchn_callback+0xd/0x20 > [ 92.671529] ? check_events+0x16/0x30 > [ 92.671543] ? xen_irq_enable_direct+0x1d/0x30 > [ 92.671560] ? finish_task_switch.isra.0+0x8e/0x270 > [ 92.671579] ? __switch_to+0x165/0x3b0 > [ 92.671593] ? __schedule+0x316/0x8b0 > [ 92.671611] ? schedule_idle+0x25/0x40 > [ 92.671631] ? cpu_startup_entry+0x25/0x30 > [ 92.671644] ? cpu_bringup_and_idle+0x89/0xa0 > [ 92.671663] ? asm_cpu_bringup_and_idle+0x9/0x10 > [ 92.671683] </TASK> > [ 92.671691] ---[ end trace 0000000000000000 ]--- > [ 92.671782] Kernel Offset: disabled > (XEN) Hardware Dom0 crashed: rebooting machine in 5 seconds. > > > If I change order=PAGE_ALLOC_COSTLY_ORDER+1, then this: > > > [ 2205.112802] BUG: unable to handle page fault for address: ffffffff89630301 > [ 2205.112866] #PF: supervisor write access in kernel mode > [ 2205.112882] #PF: error_code(0x0002) - not-present page > [ 2205.112899] PGD 2a35067 P4D 2a35067 PUD 2a36067 PMD 0 > [ 2205.112921] Oops: 0002 [#1] PREEMPT SMP NOPTI > [ 2205.112946] CPU: 0 PID: 12609 Comm: kworker/u12:9 Tainted: G W 6.5.6-dirty #355 > [ 2205.112979] Hardware name: Star Labs StarBook/StarBook, BIOS 8.97 10/03/2023 > [ 2205.112997] Workqueue: kcryptd/252:0 kcryptd_crypt > [ 2205.113022] RIP: e030:get_page_from_freelist+0x281/0x10c0 > [ 2205.113044] Code: 6c 05 18 49 89 df 8b 5c 24 34 49 8b 47 18 48 39 c5 0f 84 85 02 00 00 49 8b 47 18 48 8b 48 08 48 8b 30 48 8d 50 f8 48 89 4e 08 <48> 89 31 48 b9 00 01 00 00 00 00 ad de 48 89 08 48 83 c1 22 48 89 > [ 2205.113079] RSP: e02b:ffffc90041ea7c48 EFLAGS: 00010283 > [ 2205.113096] RAX: ffffea00059b9248 RBX: 0000000000000001 RCX: ffffffff89630301 > [ 2205.113117] RDX: ffffea00059b9240 RSI: ffffea00059b9201 RDI: 0000000000000001 > [ 2205.113134] RBP: ffff888189631718 R08: 000000000000c000 R09: 000000000003cb07 > [ 2205.113153] R10: 0000000000000001 R11: fefefefefefefeff R12: ffff888075f66b00 > [ 2205.113171] R13: ffff888189631700 R14: 0000000000000000 R15: ffff888189631700 > [ 2205.113208] FS: 0000000000000000(0000) GS:ffff888189600000(0000) knlGS:0000000000000000 > [ 2205.113229] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 2205.113245] CR2: ffffffff89630301 CR3: 00000001049d0000 CR4: 0000000000050660 > [ 2205.113272] Call Trace: > [ 2205.113285] <TASK> > [ 2205.113295] ? __die+0x1e/0x60 > [ 2205.113312] ? page_fault_oops+0x178/0x4a0 > [ 2205.113330] ? exc_page_fault+0x14e/0x160 > [ 2205.113346] ? asm_exc_page_fault+0x26/0x30 > [ 2205.113363] ? get_page_from_freelist+0x281/0x10c0 > [ 2205.113379] ? get_page_from_freelist+0x227/0x10c0 > [ 2205.113396] __alloc_pages+0x1dd/0x300 > [ 2205.113412] crypt_page_alloc+0x29/0x60 > [ 2205.113425] mempool_alloc+0x81/0x1b0 > [ 2205.113443] kcryptd_crypt+0x293/0x4b0 > [ 2205.113458] process_one_work+0x1e0/0x3e0 > [ 2205.113476] worker_thread+0x49/0x3b0 > [ 2205.113490] ? _raw_spin_lock_irqsave+0x22/0x50 > [ 2205.113510] ? __pfx_worker_thread+0x10/0x10 > [ 2205.113527] kthread+0xef/0x120 > [ 2205.113541] ? __pfx_kthread+0x10/0x10 > [ 2205.113554] ret_from_fork+0x2c/0x50 > [ 2205.113568] ? __pfx_kthread+0x10/0x10 > [ 2205.113581] ret_from_fork_asm+0x1b/0x30 > [ 2205.113598] </TASK> > [ 2205.113606] Modules linked in: snd_hda_codec_hdmi snd_sof_pci_intel_tgl snd_sof_intel_hda_common snd_soc_hdac_hda soundwire_intel soundwire_generic_allocation snd_sof_intel_hda_mlink soundwire_cadence snd_sof_intel_hda snd_sof_pci snd_hda_codec_generic snd_sof ledtrig_audio snd_sof_utils snd_sof_xtensa_dsp snd_soc_acpi_intel_match snd_soc_acpi snd_hda_ext_core soundwire_bus snd_soc_core snd_compress snd_pcm_dmaengine ac97_bus snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hwdep snd_hda_core snd_seq snd_seq_device snd_pcm hid_multitouch snd_timer snd i2c_designware_platform i2c_designware_core i2c_i801 soundcore iwlwifi idma64 i2c_smbus i2c_hid_acpi i2c_hid pinctrl_tigerlake pinctrl_intel xen_acpi_processor xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput efivarfs > [ 2205.113795] CR2: ffffffff89630301 > [ 2205.113808] ---[ end trace 0000000000000000 ]--- > [ 2205.113822] RIP: e030:get_page_from_freelist+0x281/0x10c0 > [ 2205.113839] Code: 6c 05 18 49 89 df 8b 5c 24 34 49 8b 47 18 48 39 c5 0f 84 85 02 00 00 49 8b 47 18 48 8b 48 08 48 8b 30 48 8d 50 f8 48 89 4e 08 <48> 89 31 48 b9 00 01 00 00 00 00 ad de 48 89 08 48 83 c1 22 48 89 > [ 2205.113873] RSP: e02b:ffffc90041ea7c48 EFLAGS: 00010283 > [ 2205.113887] RAX: ffffea00059b9248 RBX: 0000000000000001 RCX: ffffffff89630301 > [ 2205.113903] RDX: ffffea00059b9240 RSI: ffffea00059b9201 RDI: 0000000000000001 > [ 2205.113919] RBP: ffff888189631718 R08: 000000000000c000 R09: 000000000003cb07 > [ 2205.113935] R10: 0000000000000001 R11: fefefefefefefeff R12: ffff888075f66b00 > [ 2205.113950] R13: ffff888189631700 R14: 0000000000000000 R15: ffff888189631700 > [ 2205.113980] FS: 0000000000000000(0000) GS:ffff888189600000(0000) knlGS:0000000000000000 > [ 2205.113998] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 2205.114012] CR2: ffffffff89630301 CR3: 00000001049d0000 CR4: 0000000000050660 > [ 2205.114038] note: kworker/u12:9[12609] exited with irqs disabled > [ 2205.114100] note: kworker/u12:9[12609] exited with preempt_count 2 > > Then retried with order=PAGE_ALLOC_COSTLY_ORDER and > PAGE_ALLOC_COSTLY_ORDER back at 3, and also got similar crash. So, does it mean that even allocating with order=PAGE_ALLOC_COSTLY_ORDER isn't safe? Try enabling CONFIG_DEBUG_VM (it also needs CONFIG_DEBUG_KERNEL) and try to provoke a similar crash. Let's see if it crashes on one of the VM_BUG_ON statements. Mikulas > Both happened only after logging into X session (lightdm -> Xfce) and > starting xfce4-terminal. If I use text console/ssh/serial and leave > lightdm at login screen, then it does not crash (this is in fact how I > did most previous tests). I have no idea if it's related to some other > bug somewhere else (graphics driver?), or simply higher memory usage due > to the whole Xfce session running. > It could be also a coincidence, the sample size is rather small... > But could be also some memory corruption that depending on memory layout > sometimes results in a crash and sometimes in "just" storage freeze. > > Note this all is still on top of 6.5.6 with changes we discuss here. If > you believe it's another issue that got fixed in the meantime, I can > switch to another version, but otherwise I'd like to limit changes. > > -- > Best Regards, > Marek Marczykowski-Górecki > Invisible Things Lab >
