Hi! > > I'm getting this during boot: 32-bit thinkpad x60. > > This is very odd. > > The change in next is essentially a revert of a change, maybe I'm > missing something and the revert isn't quite a revert. Although > there was one difference. > > I'll check for other revert differences too. > > Are you in a position to check a kernel without the 5.9 change > if I send you a patch? I think I can revert changes myself. pavel@amd:/data/l/linux-next-32$ git show 90fb702791bf99b959006972e8ee7bb4609f441b | git apply -R pavel@amd:/data/l/linux-next-32$ pavel@amd:/data/l/linux-next-32$ git show d7a8c5c78d37500346c25cc8887ed2c3fda8ed4d | git apply -R ...and it boots up without a warning. Let me re-apply Linus' patch: pavel@amd:/data/l/linux-next-32$ git show 90fb702791bf99b959006972e8ee7bb4609f441b | git apply pavel@amd:/data/l/linux-next-32$ ...and the oops is back: Bad Linus! [ 9.889419] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: errors=remount-ro [ 10.042221] BUG: kernel NULL pointer dereference, address: 00000000 [ 10.045702] #PF: supervisor read access in kernel mode [ 10.048142] #PF: error_code(0x0000) - not-present page [ 10.052172] *pdpt = 00000000031ea001 *pde = 0000000000000000 [ 10.052172] Oops: 0000 [#1] PREEMPT SMP PTI [ 10.052172] CPU: 1 PID: 2764 Comm: update-binfmts Not tainted 5.9.0-next-20201015+ #154 [ 10.065205] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW (2.19 ) 03/31/2011 [ 10.065205] EIP: __kernel_write+0xd4/0x230 [ 10.065205] Code: 89 d6 64 8b 15 b4 77 4c c5 8b 8a 38 0b 00 00 31 d2 85 c9 74 04 0f b7 51 30 66 89 75 e8 8b 75 ac 8d 4d b0 89 45 e4 66 89 55 ea <8b> 06 8b 56 04 57 6a 01 89 45 d4 8d 45 b8 89 55 d8 ba 01 00 00 00 [ 10.065205] EAX: 00020000 EBX: c192d640 ECX: c2b89ad0 EDX: 00000000 [ 10.065205] ESI: 00000000 EDI: 0000012c EBP: c2b89b20 ESP: c2b89acc [ 10.065205] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010282 [ 10.065205] CR0: 80050033 CR2: 00000000 CR3: 03414000 CR4: 000006b0 [ 10.065205] Call Trace: [ 10.065205] ? __mutex_unlock_slowpath+0x2b/0x2c0 [ 10.065205] ? dma_direct_map_sg+0x13a/0x320 [ 10.065205] autofs_notify_daemon+0x14d/0x2b0 [ 10.065205] autofs_wait+0x4cd/0x770 [ 10.065205] ? autofs_d_automount+0xd6/0x1e0 [ 10.065205] autofs_mount_wait+0x43/0xe0 [ 10.065205] autofs_d_automount+0xdf/0x1e0 [ 10.065205] __traverse_mounts+0x85/0x200 [ 10.065205] step_into+0x368/0x620 [ 10.065205] ? proc_setup_thread_self+0x110/0x110 [ 10.065205] walk_component+0x58/0x190 [ 10.065205] link_path_walk.part.0+0x245/0x360 [ 10.065205] path_lookupat.isra.0+0x31/0x130 [ 10.065205] filename_lookup+0x8d/0x130 [ 10.065205] ? cache_alloc_debugcheck_after+0x151/0x180 [ 10.065205] ? getname_flags+0x1f/0x160 [ 10.065205] ? kmem_cache_alloc+0x75/0x100 [ 10.065205] user_path_at_empty+0x25/0x30 [ 10.065205] vfs_statx+0x63/0x100 [ 10.065205] ? _raw_spin_unlock+0x18/0x30 [ 10.065205] ? replace_page_cache_page+0x160/0x160 [ 10.065205] __do_sys_stat64+0x36/0x60 [ 10.065205] ? exit_to_user_mode_prepare+0x35/0xe0 [ 10.065205] ? irqentry_exit_to_user_mode+0x8/0x20 [ 10.065205] ? irqentry_exit+0x55/0x70 [ 10.065205] ? exc_page_fault+0x228/0x3c0 [ 10.065205] __ia32_sys_stat64+0xd/0x10 [ 10.065205] do_int80_syscall_32+0x2c/0x40 [ 10.065205] entry_INT80_32+0x111/0x111 [ 10.065205] EIP: 0xb7f03092 [ 10.065205] Code: 00 00 00 e9 90 ff ff ff ff a3 24 00 00 00 68 30 00 00 00 e9 80 ff ff ff ff a3 e8 ff ff ff 66 90 00 00 00 00 00 00 00 00 cd 80 <c3> 8d b4 26 00 00 00 00 8d b6 00 00 00 00 8b 1c 24 c3 8d b4 26 00 [ 10.065205] EAX: ffffffda EBX: 004fa490 ECX: bfaf7e6c EDX: 004f9348 [ 10.065205] ESI: 00000000 EDI: 004fa490 EBP: bfaf7e6c ESP: bfaf7e44 [ 10.065205] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000296 [ 10.065205] Modules linked in: [ 10.065205] CR2: 0000000000000000 [ 10.073216] ---[ end trace 13a709ba02b08366 ]--- [ 10.073221] EIP: __kernel_write+0xd4/0x230 [ 10.073224] Code: 89 d6 64 8b 15 b4 77 4c c5 8b 8a 38 0b 00 00 31 d2 85 c9 74 04 0f b7 51 30 66 89 75 e8 8b 75 ac 8d 4d b0 89 45 e4 66 89 55 ea <8b> 06 8b 56 04 57 6a 01 89 45 d4 8d 45 b8 89 55 d8 ba 01 00 00 00 [ 10.073226] EAX: 00020000 EBX: c192d640 ECX: c2b89ad0 EDX: 00000000 [ 10.073228] ESI: 00000000 EDI: 0000012c EBP: c2b89b20 ESP: c2b89acc [ 10.073230] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010282 [ 10.073232] CR0: 80050033 CR2: b7e10020 CR3: 03414000 CR4: 000006b0 [ 10.453818] systemd-journald[2512]: Received request to flush runtime journal from PID 1 [ 24.752167] iwl3945 0000:03:00.0: loaded firmware version 15.32.2.9 > And we should check if that difference to what was originally > there is the source of the problem, so probably two things to > follow up on, reverting that small difference first would be > the way to go. > > Are you able to reliably reproduce it? Looks so, yes. Best regards, Pavel -- http://www.livejournal.com/~pavelmachek
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