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Subject5.4-rc8 OOPS from path_openat->link_path_walk->inode_permission, on sparc64
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Just tried 5.3 and 5.4-rc8 on my revived Sun Netra 240 (Ultrasparc III).
gcc-8 was used to compile 5.3, then as a test, packages were upgraded so
gcc-9 was used to compile the 5.4-rc8 kernel in question. Did not see any problems with 5.3.

Started some more package upgrades with 5.4-rc8 with apt and got a crash:

[ 294.269620] Kernel unaligned access at TPC[5a9e84] generic_permission+0x164/0x200
[ 294.368107] Unable to handle kernel paging request in mna handler
[ 294.368110] at virtual address 91d0200591d02055
[ 294.508933] current->{active_,}mm->context = 0000000000000001
[ 294.584438] current->{active_,}mm->pgd = fff000133c930000
[ 294.655439] \|/ ____ \|/
[ 294.655439] "@'/ .. \`@"
[ 294.655439] /_| \__/ |_\
[ 294.655439] \__U_/
[ 294.848739] systemd(1): Oops [#1]
[ 294.892191] CPU: 0 PID: 1 Comm: systemd Not tainted 5.4.0-rc8 #12
[ 294.972257] TSTATE: 0000009111001600 TPC: 00000000005a9e84 TNPC: 00000000005a9e88 Y: 00000000 Not tainted
[ 295.101497] TPC: <generic_permission+0x164/0x200>
[ 295.163253] g0: 0000000000000000 g1: 91d0200591d02005 g2: 00000000000091d0 g3: 0000000000010000
[ 295.277641] g4: fff000133c0ab760 g5: fff000133ec8a000 g6: fff000133c100000 g7: 0000000000000000
[ 295.392015] o0: 0000000000000001 o1: fff000133c103d38 o2: fff000133c103a40 o3: fff000133c103a38
[ 295.506381] o4: fff000133c103a34 o5: 0000000000040000 sp: fff000133c1030f1 ret_pc: 00000000005abc3c
[ 295.625335] RPC: <lookup_fast+0x9c/0x2c0>
[ 295.677938] l0: fff000133c9bde60 l1: 0000000000200008 l2: 0000010000284df0 l3: 000007feffd41088
[ 295.792320] l4: 00000100000fb0a0 l5: 000001000026ac10 l6: 0000000000000000 l7: fff0000100a65d20
[ 295.906690] i0: fff000132e001d08 i1: 0000000000000081 i2: fff000133c103a38 i3: fff000133c103a34
[ 296.021068] i4: 0000000000000001 i5: 00000000000091d0 i6: fff000133c1031a1 i7: 00000000005a9f40
[ 296.135438] I7: <inode_permission+0x20/0x1e0>
[ 296.192623] Call Trace:
[ 296.224647] [00000000005a9f40] inode_permission+0x20/0x1e0
[ 296.297851] [00000000005ad8f4] link_path_walk.part.0+0x74/0x540
[ 296.376770] [00000000005ae498] path_openat+0x78/0x12e0
[ 296.445420] [00000000005b0608] do_filp_open+0x48/0xc0
[ 296.512994] [000000000059c168] do_sys_open+0x168/0x240
[ 296.581716] [0000000000406254] linux_sparc_syscall+0x34/0x44
[ 296.657291] Disabling lock debugging due to kernel taint
[ 296.727063] Caller[00000000005a9f40]: inode_permission+0x20/0x1e0
[ 296.807121] Caller[00000000005ad8f4]: link_path_walk.part.0+0x74/0x540
[ 296.892905] Caller[00000000005ae498]: path_openat+0x78/0x12e0
[ 296.968388] Caller[00000000005b0608]: do_filp_open+0x48/0xc0
[ 297.042734] Caller[000000000059c168]: do_sys_open+0x168/0x240
[ 297.118218] Caller[0000000000406254]: linux_sparc_syscall+0x34/0x44
[ 297.200570] Caller[fff0000100207200]: 0xfff0000100207200
[ 297.270332] Instruction DUMP:
[ 297.270334] b8102000
[ 297.309217] c25e2028
[ 297.340098] 07000040
[ 297.370982] <c2586050>
[ 297.401860] 82084003
[ 297.432743] 22c04007
[ 297.463623] d0062008
[ 297.494506] 8408a038
[ 297.525384] 80a0a000
[ 297.556264]
[ 297.643992] printk: systemd: 15 output lines suppressed due to ratelimiting
[ 297.735610] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[ 297.836282] Press Stop-A (L1-A) from sun keyboard or send break
[ 297.836282] twice on console to return to the boot prom
[ 297.982667] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 ]---

--
Meelis Roos <mroos@linux.ee>

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